| obligate | (adjective) restricted to a particular condition of life | - |
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| obligated | (adjective) caused by law or conscience to follow a certain course | - |
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| obligational | (adjective) relating or constituting or qualified to create a legal or financial obligation | - |
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| obligatory | (adjective) morally or legally constraining or binding | - |
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| (adjective) required by obligation or compulsion or convention | - |
| obliged | (adjective) under a moral obligation to do something | Synonyms: duty-bound |
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| obliging | (adjective) showing a cheerful willingness to do favors for others | Synonyms: complaisant |
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| oligarchic | (adjective) of or relating to or supporting or characteristic of an oligarchy | Synonyms: oligarchical |
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| oligarchical | (adjective) of or relating to or supporting or characteristic of an oligarchy | Synonyms: oligarchic |
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| original | (adjective) being or productive of something fresh and unusual; or being as first made or thought of | - |
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| (adjective) (of e.g. information) not secondhand or by way of something intermediary | - |
| (adjective) not derived or copied or translated from something else | - |
| (adjective) preceding all others in time or being as first made or performed | - |
| originative | (adjective) having the ability or power to create | Synonyms: creative |
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| (adjective) containing seeds of later development | Synonyms: germinal, seminal |
| outrigged | (adjective) rigged with a structure projecting from or over the side of a boat for various purposes; to prevent capsizing or to support an oarlock or to help secure a mast etc | - |
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| outright | (adjective) without reservation or exception | Synonyms: straight-out, unlimited |
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| overnight | (adjective) lasting, open, or operating through the whole night | Synonyms: all-night, nightlong |
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| overweight | (adjective) usually describes a large person who is fat but has a large frame to carry it | Synonyms: fleshy, heavy |
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| paradigmatic | (adjective) of or relating to a typical example | - |
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| (adjective) of or relating to a grammatical paradigm | - |
| (adjective) related as members of a substitution class | - |
| pedigree | (adjective) having a list of ancestors as proof of being a purebred animal | Synonyms: pedigreed, pureblood, pureblooded, thoroughbred |
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| pedigreed | (adjective) having a list of ancestors as proof of being a purebred animal | Synonyms: pedigree, pureblood, pureblooded, thoroughbred |
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| pemphigous | (adjective) of or relating to or manifesting pemphigus | - |
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| perigonal | (adjective) of or relating to a perigone | - |
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| periwigged | (adjective) wearing a wig popular for men in the 17th and 18th centuries | Synonyms: peruked |
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| piggish | (adjective) resembling swine; coarsely gluttonous or greedy | Synonyms: hoggish, piggy, porcine, swinish |
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| piggy | (adjective) resembling swine; coarsely gluttonous or greedy | Synonyms: hoggish, piggish, porcine, swinish |
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| pigheaded | (adjective) obstinate and stupid | Synonyms: bullet-headed, bullheaded |
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| plantigrade | (adjective) (of mammals) walking on the whole sole of the foot (as rabbits, raccoons, bears, and humans do) | - |
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| poignant | (adjective) arousing affect | Synonyms: affecting, touching |
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| (adjective) keenly distressing to the mind or feelings | - |
| predigested | (adjective) artificially partially digested as by enzymatic action | - |
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| prefigurative | (adjective) indistinctly prophetic | Synonyms: adumbrative, foreshadowing |
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| prestigious | (adjective) exerting influence by reason of high status or prestige | - |
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| (adjective) having an illustrious reputation; respected | Synonyms: esteemed, honored, honoured |
| priggish | (adjective) exaggeratedly proper | Synonyms: prim, prissy, prudish, puritanical, square-toed, straight-laced, straightlaced, strait-laced, straitlaced, tight-laced, victorian |
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| prodigal | (adjective) recklessly wasteful | Synonyms: extravagant, profligate, spendthrift |
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| prodigious | (adjective) far beyond what is usual in magnitude or degree | Synonyms: exceeding, exceptional, olympian, surpassing |
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| (adjective) so great in size or force or extent as to elicit awe | Synonyms: colossal, stupendous |
| (adjective) of momentous or ominous significance | Synonyms: portentous |
| profligate | (adjective) unrestrained by convention or morality | Synonyms: debauched, degenerate, degraded, dissipated, dissolute, fast, libertine, riotous |
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| (adjective) recklessly wasteful | Synonyms: extravagant, prodigal, spendthrift |
| pyroligneous | (adjective) of a substance produced by the effect of heat on wood, especially by destructive distillation | Synonyms: pyrolignic |
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| pyrolignic | (adjective) of a substance produced by the effect of heat on wood, especially by destructive distillation | Synonyms: pyroligneous |
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| rectosigmoid | (adjective) of or related to or near the sigmoid colon and the upper part of the rectum | - |
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| refrigerant | (adjective) causing cooling or freezing | Synonyms: refrigerating |
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| refrigerated | (adjective) made or kept cold by refrigeration | - |
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| refrigerating | (adjective) causing cooling or freezing | Synonyms: refrigerant |
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| reigning | (adjective) exercising power or authority | Synonyms: regnant, ruling |
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| reinvigorated | (adjective) with restored energy | Synonyms: fresh, invigorated, refreshed |
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| religious | (adjective) having or showing belief in and reverence for a deity | - |
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| (adjective) of or relating to clergy bound by monastic vows | - |
| (adjective) concerned with sacred matters or religion or the church | Synonyms: spiritual |
| (adjective) extremely scrupulous and conscientious | - |
| rigged | (adjective) fitted or equipped with necessary rigging (sails and shrouds and stays etc) | - |
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| right | (adjective) being or located on or directed toward the side of the body to the east when facing north | - |
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| (adjective) in conformance with justice or law or morality | - |
| (adjective) free from error; especially conforming to fact or truth | Synonyms: correct |
| (adjective) of or belonging to the political or intellectual right | - |
| (adjective) correct in opinion or judgment | Synonyms: correct |
| (adjective) precisely accurate | Synonyms: veracious |
| (adjective) appropriate for a condition or purpose or occasion or a person's character, needs | Synonyms: proper |
| (adjective) (informal) very; used informally as an intensifier | Synonyms: one |
| (adjective) most suitable or right for a particular purpose | Synonyms: good, ripe |
| (adjective) (of the side of cloth or clothing) facing or intended to face outward | - |
| (adjective) having the axis perpendicular to the base | - |
| (adjective) intended for the right hand | Synonyms: right-hand |
| (adjective) in or into a satisfactory condition | - |
| (adjective) socially right or correct | Synonyms: correct |
| (adjective) in accord with accepted standards of usage or procedure | Synonyms: correct |
| righteous | (adjective) characterized by or proceeding from accepted standards of morality or justice | - |
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| (adjective) morally justified | - |
| rightful | (adjective) legally valid | - |
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| (adjective) having a legally established claim | Synonyms: lawful, true |
| rightish | (adjective) tending toward the political right | - |
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| rightist | (adjective) believing in or supporting tenets of the political right | Synonyms: right-wing |
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| rightmost | (adjective) farthest to the right | - |
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| rigid | (adjective) designating an airship or dirigible having a form maintained by a stiff unyielding frame or structure | - |
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| (adjective) incapable of or resistant to bending | Synonyms: stiff |
| (adjective) incapable of compromise or flexibility | Synonyms: strict |
| (adjective) fixed and unmoving | Synonyms: fixed, set |
| (adjective) incapable of adapting or changing to meet circumstances | Synonyms: inflexible, unbending |
| rigorous | (adjective) demanding strict attention to rules and procedures | Synonyms: stringent, tight |
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| (adjective) rigidly accurate; allowing no deviation from a standard | Synonyms: strict |
| semirigid | (adjective) not fully rigid | - |
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| (adjective) having a form maintained by a rigid internal structure as well as by internal gas pressure | - |
| shortsighted | (adjective) unable to see distant objects clearly | Synonyms: myopic, nearsighted |
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| (adjective) lacking foresight or scope | Synonyms: myopic, short, unforesightful |
| (adjective) not given careful consideration | Synonyms: ill-considered, ill-judged, improvident |
| sighted | (adjective) able to see | - |
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| sightless | (adjective) lacking sight | Synonyms: eyeless, unseeing |
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| sightly | (adjective) very pleasing to the eye | Synonyms: bonnie, bonny, comely, fair |
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| sigmoid | (adjective) of or relating to the sigmoid flexure in the large intestine | Synonyms: sigmoidal |
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| (adjective) curved in two directions (like the letter S) | - |
| sigmoidal | (adjective) of or relating to the sigmoid flexure in the large intestine | Synonyms: sigmoid |
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| sign | (adjective) used of the language of the deaf | Synonyms: gestural, sign-language, signed |
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| signal | (adjective) notably out of the ordinary | - |
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| signed | (adjective) having a handwritten signature | - |
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| (adjective) used of the language of the deaf | Synonyms: gestural, sign-language, sign |
| significant | (adjective) important in effect or meaning | Synonyms: important |
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| (adjective) too closely correlated to be attributed to chance and therefore indicating a systematic relation | - |
| (adjective) of considerable importance, size, or worth | Synonyms: substantial |
| (adjective) rich in significance or implication | Synonyms: meaning, pregnant |
| significative | (adjective) (usually followed by `of') pointing out or revealing clearly | Synonyms: indicative, indicatory, revelatory, suggestive |
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| skintight | (adjective) so tight as to cling to the skin | Synonyms: skin-tight |
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| slight | (adjective) (quantifier used with mass nouns) small in quantity or degree; not much or almost none or (with `a') at least some | Synonyms: little |
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| (adjective) lacking substance or significance | Synonyms: flimsy, fragile, tenuous, thin |
| (adjective) being of delicate or slender build | Synonyms: slender, slim, svelte |
| slighting | (adjective) tending to diminish or disparage | Synonyms: belittling, deprecating, deprecative, deprecatory, depreciative, depreciatory |
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| soigne | (adjective) polished and well-groomed; showing sophisticated elegance | Synonyms: soignee |
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| soignee | (adjective) polished and well-groomed; showing sophisticated elegance | Synonyms: soigne |
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| sovereign | (adjective) greatest in status or authority or power | Synonyms: supreme |
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| (adjective) (of political bodies) not controlled by outside forces | Synonyms: autonomous, independent, self-governing |
| sprigged | (adjective) decorated with designs of sprigs | - |
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| sprightly | (adjective) full of spirit and vitality | - |
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| squiggly | (adjective) wavy and twisting | - |
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| stigmatic | (adjective) not astigmatic | Synonyms: anastigmatic |
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| (adjective) pertaining to a lens or lens system free of astigmatism (able to form point images) | Synonyms: anastigmatic |
| (adjective) pertaining to or resembling or having stigmata | - |
| straight | (adjective) having no deviations | - |
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| (adjective) no longer coiled | Synonyms: uncoiled |
| (adjective) (of hair) having no waves or curls | - |
| (adjective) characterized by honesty and fairness | Synonyms: square |
| (adjective) free from curves or angles | - |
| (adjective) in keeping with the facts | - |
| (adjective) successive (without a break) | Synonyms: consecutive |
| (adjective) rigidly conventional or old-fashioned | Synonyms: square |
| (adjective) following a correct or logical method | - |
| (adjective) without evasion or compromise | Synonyms: square, straightforward |
| (adjective) erect in posture | Synonyms: unbent, unbowed |
| (adjective) not homosexual | - |
| (adjective) neatly arranged; not disorderly | - |
| (adjective) (of an alcoholic drink) without water | Synonyms: full-strength, neat |
| (adjective) accurately fitted; level | Synonyms: true |
| straightarrow | (adjective) conventionally moral and upright | - |
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| straightaway | (adjective) performed with little or no delay | Synonyms: immediate, prompt, quick |
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| straightforward | (adjective) pointed directly ahead | - |
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| (adjective) without evasion or compromise | Synonyms: square, straight |
| (adjective) without concealment or deception; honest | Synonyms: aboveboard |
| (adjective) free from ambiguity | - |
| straightlaced | (adjective) exaggeratedly proper | Synonyms: priggish, prim, prissy, prudish, puritanical, square-toed, straight-laced, strait-laced, straitlaced, tight-laced, victorian |
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| tigerish | (adjective) resembling a tiger in fierceness and lack of mercy | - |
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| tight | (adjective) closely constrained or constricted or constricting | - |
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| (adjective) of such close construction as to be impermeable | - |
| (adjective) pressed tightly together | Synonyms: compressed |
| (adjective) packed closely together | - |
| (adjective) demanding strict attention to rules and procedures | Synonyms: rigorous, stringent |
| (adjective) exasperatingly difficult to handle or circumvent | Synonyms: nasty |
| (adjective) (of a contest or contestants) evenly matched | Synonyms: close |
| (adjective) of textiles | Synonyms: close |
| (adjective) very drunk | Synonyms: besotted, blind drunk, blotto, cockeyed, crocked, fuddled, loaded, pie-eyed, pissed, pixilated, plastered, slopped, sloshed, smashed, soaked, soused, sozzled, squiffy, stiff, wet |
| (adjective) set so close together as to be invulnerable to penetration | - |
| (adjective) affected by scarcity and expensive to borrow | - |
| (adjective) securely or solidly fixed in place; rigid | - |
| (adjective) (used of persons or behavior) characterized by or indicative of lack of generosity | Synonyms: mean, mingy, miserly |
| (adjective) pulled or drawn tight | Synonyms: taut |
| tightfisted | (adjective) unwilling to part with money | Synonyms: closefisted, hardfisted |
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| tightfitting | (adjective) fitting snugly | Synonyms: skinny, tight-fitting, tight fitting, tightly fitting |
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| tightlipped | (adjective) inclined to secrecy or reticence about divulging information | Synonyms: close, closelipped, closemouthed, secretive |
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| trig | (adjective) neat and smart in appearance | Synonyms: clean-cut, trim |
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| trigonal | (adjective) having threefold symmetry | Synonyms: rhombohedral |
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| trigonometric | (adjective) of or relating to or according to the principles of trigonometry | - |
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| twiggy | (adjective) thin as a twig | Synonyms: twiglike |
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| twiglike | (adjective) thin as a twig | Synonyms: twiggy |
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| twilight | (adjective) lighted by or as if by twilight | Synonyms: dusky, twilit |
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| unambiguous | (adjective) having or exhibiting a single clearly defined meaning | - |
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| (adjective) admitting of no doubt or misunderstanding; having only one meaning or interpretation and leading to only one conclusion | Synonyms: unequivocal, univocal |
| unassignable | (adjective) incapable of being transferred | Synonyms: nontransferable, untransferable |
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| unassigned | (adjective) not assigned | - |
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| unbigoted | (adjective) not opinionated | - |
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| underweight | (adjective) being very thin | Synonyms: boney, bony, scraggly, scraggy, scrawny, skinny, weedy |
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| undesigned | (adjective) not done or made or performed with purpose or intent | - |
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| undigested | (adjective) not digested | - |
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| (adjective) not thought over and arranged systematically in the mind; not absorbed or assimilated mentally | - |
| undignified | (adjective) lacking dignity | - |
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| unenlightened | (adjective) not enlightened; ignorant | - |
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| (adjective) lacking information or instruction | Synonyms: naive, uninstructed |
| unenlightening | (adjective) failing to inform or clarify | Synonyms: unilluminating |
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| (adjective) not edifying | Synonyms: unedifying |
| unfeigned | (adjective) not pretended; sincerely felt or expressed | Synonyms: genuine, true |
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| unforesightful | (adjective) lacking foresight or scope | Synonyms: myopic, short, shortsighted |
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