| acropetal | (adjective) of leaves or flowers; developing or opening in succession from base to apex | - |
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| alopecic | (adjective) pertaining to loss of hair or wool or feathers | - |
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| anoperineal | (adjective) relating to the anus and surrounding perineum | - |
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| apopemptic | (adjective) addressed to one who is departing | - |
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| aposiopetic | (adjective) relating to or characteristic of aposiopesis | - |
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| aslope | (adjective) having an oblique or slanted direction | Synonyms: aslant, diagonal, slanted, slanting, sloped, sloping |
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| cooperative | (adjective) done with or working with others for a common purpose or benefit | - |
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| (adjective) involving the joint activity of two or more | Synonyms: concerted, conjunct, conjunctive, united |
| (adjective) willing to adjust to differences in order to obtain agreement | Synonyms: accommodative |
| copesetic | (adjective) completely satisfactory | Synonyms: copacetic, copasetic, copesettic |
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| copesettic | (adjective) completely satisfactory | Synonyms: copacetic, copasetic, copesetic |
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| cyclopean | (adjective) of or relating to or resembling the Cyclops | - |
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| developed | (adjective) being changed over time so as to be e.g. stronger or more complete or more useful | - |
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| (adjective) (of real estate) made more useful and profitable as by building or laying out roads | - |
| (adjective) (used of societies) having high industrial development | Synonyms: highly-developed |
| doped | (adjective) under the influence of narcotics | Synonyms: drugged, narcotised, narcotized |
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| (adjective) treated or impregnated with a foreign substance | - |
| dopey | (adjective) having or revealing stupidity | Synonyms: anserine, dopy, foolish, gooselike, goosey, goosy, jerky |
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| encyclopedic | (adjective) comprehensive in scope or content (as an encyclopedia) | Synonyms: encyclopaedic |
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| gamopetalous | (adjective) having a corolla composed of partially or wholly fused petals forming a corolla shaped like a tube or funnel | Synonyms: sympetalous |
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| hopeful | (adjective) having or manifesting hope | - |
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| (adjective) likely to turn out well in the future | Synonyms: bright, promising |
| hopeless | (adjective) without hope because there seems to be no possibility of comfort or success | - |
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| (adjective) (informal to emphasize how bad it is) beyond hope of management or reform | - |
| (adjective) certain to fail | - |
| (adjective) of a person unable to do something skillfully | - |
| improper | (adjective) not suitable or right or appropriate | - |
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| (adjective) not appropriate for a purpose or occasion | Synonyms: wrong |
| (adjective) not conforming to legality, moral law, or social convention | Synonyms: unconventional, unlawful |
| inoperable | (adjective) not suitable for surgery | - |
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| (adjective) not able to perform its normal function | - |
| inoperative | (adjective) not working or taking effect | - |
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| interoperable | (adjective) able to exchange and use information | - |
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| nonopening | (adjective) not open; not opening | - |
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| nonoperational | (adjective) (military) not involved in military operations | Synonyms: inactive |
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| open | (adjective) ready or willing to receive favorably | Synonyms: receptive |
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| (adjective) affording unobstructed entrance and exit; not shut or closed | Synonyms: unfastened |
| (adjective) affording free passage or access | - |
| (adjective) (set theory) of an interval that contains neither of its endpoints | - |
| (adjective) open and observable; not secret or hidden | Synonyms: overt |
| (adjective) used of mouth or eyes | Synonyms: opened |
| (adjective) ready for business | - |
| (adjective) not having been filled | - |
| (adjective) (of textures) full of small openings or gaps | Synonyms: loose |
| (adjective) openly straightforward and direct without reserve or secretiveness | Synonyms: candid, heart-to-heart |
| (adjective) not requiring union membership | - |
| (adjective) open to or in view of all | - |
| (adjective) possibly accepting or permitting | Synonyms: capable, subject |
| (adjective) without undue constriction as from e.g. tenseness or inhibition | - |
| (adjective) having no protecting cover or enclosure | - |
| (adjective) affording free passage or view | Synonyms: clear |
| (adjective) with no protection or shield | Synonyms: exposed |
| (adjective) accessible to all | - |
| (adjective) not sealed or having been unsealed | Synonyms: opened |
| (adjective) not brought to a conclusion; subject to further thought | Synonyms: undecided, undetermined, unresolved |
| (adjective) not defended or capable of being defended | Synonyms: assailable, undefendable, undefended |
| opencast | (adjective) (of mines and mining) worked from the exposed surface | Synonyms: opencut |
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| opencut | (adjective) (of mines and mining) worked from the exposed surface | Synonyms: opencast |
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| opened | (adjective) used of mouth or eyes | Synonyms: open |
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| (adjective) made open or clear | - |
| (adjective) not sealed or having been unsealed | Synonyms: open |
| openhanded | (adjective) given or giving freely | Synonyms: big, bighearted, bounteous, bountiful, freehanded, giving, handsome, liberal |
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| openhearted | (adjective) freely communicative; candidly straightforward | - |
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| (adjective) showing or motivated by sympathy and understanding and generosity | Synonyms: benevolent, charitable, good-hearted, kindly, large-hearted, sympathetic |
| opening | (adjective) first or beginning | - |
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| openmouthed | (adjective) with eyes or mouth open in surprise | Synonyms: goggle-eyed, popeyed |
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| operable | (adjective) capable of being treated by surgical operation | - |
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| (adjective) usable for a specific purpose | Synonyms: practicable |
| (adjective) fit or ready for use or service | Synonyms: functional, operational, usable, useable |
| operant | (adjective) having influence or producing an effect | - |
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| operatic | (adjective) of or relating to or characteristic of opera | - |
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| operating | (adjective) involved in a kind of operation | - |
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| (adjective) being in effect or operation | Synonyms: in operation, operational |
| operational | (adjective) (military) of or intended for or involved in military operations | - |
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| (adjective) pertaining to a process or series of actions for achieving a result | - |
| (adjective) being in effect or operation | Synonyms: in operation, operating |
| (adjective) fit or ready for use or service | Synonyms: functional, operable, usable, useable |
| operationalist | (adjective) of or relating to or espousing operationalism | - |
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| operative | (adjective) being in force or having or exerting force | - |
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| (adjective) relating to or requiring or amenable to treatment by surgery especially as opposed to medicine | Synonyms: surgical |
| (adjective) (of e.g. a machine) performing or capable of performing | Synonyms: functional, running, working |
| (adjective) effective; producing a desired effect | - |
| operculate | (adjective) having an operculum | Synonyms: operculated |
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| operculated | (adjective) having an operculum | Synonyms: operculate |
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| operose | (adjective) characterized by effort to the point of exhaustion; especially physical effort | Synonyms: arduous, backbreaking, grueling, gruelling, hard, heavy, laborious, punishing, toilsome |
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| orthopedic | (adjective) of or relating to orthopedics | Synonyms: orthopaedic, orthopedical |
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| orthopedical | (adjective) of or relating to orthopedics | Synonyms: orthopaedic, orthopedic |
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| popeyed | (adjective) having bulging eyes | - |
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| (adjective) with eyes or mouth open in surprise | Synonyms: goggle-eyed, openmouthed |
| postoperative | (adjective) happening or done after a surgical operation | - |
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| preoperative | (adjective) happening or done before and in preparation for a surgical operation | - |
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| propellant | (adjective) tending to or capable of propelling | Synonyms: propellent, propelling, propulsive |
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| propellent | (adjective) tending to or capable of propelling | Synonyms: propellant, propelling, propulsive |
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| propelling | (adjective) tending to or capable of propelling | Synonyms: propellant, propellent, propulsive |
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| proper | (adjective) marked by suitability or rightness or appropriateness | - |
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| (adjective) appropriate for a condition or purpose or occasion or a person's character, needs | Synonyms: right |
| (adjective) having all the qualities typical of the thing specified | - |
| (adjective) limited to the thing specified | - |
| propertied | (adjective) owning land or securities as a principal source of revenue | Synonyms: property-owning |
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| propertyless | (adjective) of those who work for wages especially manual or industrial laborers | Synonyms: blue-collar, wage-earning, working-class |
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| pseudoperipteral | (adjective) having columniation completely circling an area of the structure | Synonyms: peristylar |
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| ropey | (adjective) of or resembling rope (or ropes) in being long and strong | Synonyms: ropy |
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| (adjective) (British informal) very poor in quality | Synonyms: ropy |
| (adjective) forming viscous or glutinous threads | Synonyms: ropy, stringy, thready |
| scalloped | (adjective) having a margin with rounded scallops | Synonyms: crenate, crenated |
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| sloped | (adjective) having an oblique or slanted direction | Synonyms: aslant, aslope, diagonal, slanted, slanting, sloping |
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| stooped | (adjective) having the back and shoulders rounded; not erect | Synonyms: crooked, hunched, round-backed, round-shouldered, stooping |
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| telescoped | (adjective) shortened by or as if by means of parts that slide one within another or are crushed one into another | Synonyms: shortened |
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| twopenny | (adjective) of trifling worth | Synonyms: sixpenny, threepenny, tuppeny, two-a-penny, twopenny-halfpenny |
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| uncooperative | (adjective) unwilling to cooperate | - |
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| (adjective) intentionally unaccommodating | Synonyms: disobliging |
| underdeveloped | (adjective) not yet fully developed | - |
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| (adjective) relating to societies in which capital needed to industrialize is in short supply | Synonyms: developing |
| undeveloped | (adjective) not developed, mature, or fully formulated | - |
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| (adjective) not developed, improved, exploited or used | Synonyms: unexploited |
| unhoped | (adjective) so unexpected as to have not been imagined | Synonyms: unhoped-for, unthought-of, unthought |
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| unhopeful | (adjective) showing utter resignation or hopelessness | Synonyms: abject |
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| unopen | (adjective) not open | Synonyms: closed, shut |
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| unopened | (adjective) not yet opened or unsealed | - |
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| unsloped | (adjective) in a vertical position; not sloping | Synonyms: upright |
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