| quadrilateral | (adjective) having four sides | Synonyms: four-sided |
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| quadrillionth | (adjective) the ordinal number of one quadrillion in counting order | - |
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| quadripartite | (adjective) involving four parties | Synonyms: four-party |
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| quadriphonic | (adjective) of or relating to quadraphony | Synonyms: quadraphonic, quadrasonic, quadrisonic |
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| quadrisonic | (adjective) of or relating to quadraphony | Synonyms: quadraphonic, quadrasonic, quadriphonic |
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| quadruped | (adjective) having four feet | Synonyms: four-footed, quadrupedal |
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| quadrupedal | (adjective) having four feet | Synonyms: four-footed, quadruped |
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| quadruple | (adjective) four times as great or many | Synonyms: four-fold, fourfold |
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| (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruplex, quadruplicate |
| quadruplex | (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruple, quadruplicate |
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| quadruplicate | (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruple, quadruplex |
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| raddled | (adjective) showing the wearing effects of overwork or care or suffering | Synonyms: careworn, drawn, haggard, worn |
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| (adjective) used until no longer useful | Synonyms: worn-out |
| radial | (adjective) relating to or moving along or having the direction of a radius | - |
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| (adjective) relating to or near the radius | - |
| (adjective) issuing in rays from a common center; relating to rays of light | - |
| (adjective) arranged like rays or radii; radiating from a common center | Synonyms: radiate, stellate |
| radiant | (adjective) radiating or as if radiating light | Synonyms: beaming, beamy, effulgent, refulgent |
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| radiate | (adjective) having rays or ray-like parts as in the flower heads of daisies | - |
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| (adjective) arranged like rays or radii; radiating from a common center | Synonyms: radial, stellate |
| radiating | (adjective) diverging from a common point | - |
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| radical | (adjective) especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root-like stem | Synonyms: basal |
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| (adjective) of or relating to or constituting a linguistic root | - |
| (adjective) arising from or going to the root or source | - |
| (adjective) (used of opinions and actions) far beyond the norm | Synonyms: extremist, ultra |
| (adjective) markedly new or introducing radical change | Synonyms: revolutionary |
| radio | (adjective) indicating radiation or radioactivity | - |
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| radioactive | (adjective) exhibiting or caused by radioactivity | - |
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| radiographic | (adjective) relating to or produced by radiography | - |
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| radiological | (adjective) of or relating to radiology | - |
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| radiolucent | (adjective) almost complete transparent to X-rays or other forms of radiation | - |
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| radiopaque | (adjective) not transparent to X-rays or other forms of radiation | Synonyms: radio-opaque |
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| radiophonic | (adjective) relating to or by means of radiotelephony | Synonyms: radiotelephonic |
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| radiosensitive | (adjective) sensitive to radiation | - |
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| radiotelephonic | (adjective) relating to or by means of radiotelephony | Synonyms: radiophonic |
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| readable | (adjective) easily deciphered | Synonyms: clear, decipherable |
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| ready | (adjective) completely prepared or in condition for immediate action or use or progress | - |
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| (adjective) apprehending and responding with speed and sensitivity | Synonyms: quick |
| (adjective) made suitable and available for immediate use | - |
| (adjective) mentally disposed | - |
| (adjective) (of especially money) immediately available | - |
| redheaded | (adjective) having red hair and usually fair skin | - |
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| renegade | (adjective) having deserted a cause or principle | Synonyms: recreant |
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| retrograde | (adjective) of amnesia; affecting time immediately preceding trauma | - |
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| (adjective) moving from east to west on the celestial sphere; or--for planets--around the sun in a direction opposite to that of the Earth | - |
| (adjective) going from better to worse | Synonyms: retrogressive |
| (adjective) moving or directed or tending in a backward direction or contrary to a previous direction | Synonyms: retral |
| roadless | (adjective) lacking pathways | Synonyms: pathless, trackless, untracked, untrod, untrodden |
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| roundheaded | (adjective) having a brachycephalic head | Synonyms: broad-headed, short-headed |
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| saccadic | (adjective) of or related to the rapid movement of the eyes between points of fixation | - |
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| sad | (adjective) experiencing or showing sorrow or unhappiness | - |
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| (adjective) bad; unfortunate | Synonyms: deplorable, distressing, lamentable, pitiful, sorry |
| (adjective) of things that make you feel sad | - |
| saddled | (adjective) having a saddle on or being mounted on a saddled animal | - |
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| (adjective) subject to an imposed burden | - |
| sadistic | (adjective) deriving pleasure or sexual gratification from inflicting pain on another | - |
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| sadomasochistic | (adjective) of or relating to sadomasochism | - |
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| shaded | (adjective) protected from heat and light with shade or shadow | - |
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| (adjective) (of pictures or drawings) drawn or painted with degrees or gradations of shadow | - |
| shadowed | (adjective) filled with shade | Synonyms: shadowy, shady, umbrageous |
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| shadowy | (adjective) lacking clarity or distinctness | Synonyms: dim, faint, vague, wispy |
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| (adjective) lacking in substance | Synonyms: wraithlike |
| (adjective) filled with shade | Synonyms: shadowed, shady, umbrageous |
| shady | (adjective) quiet, dark, or concealed | - |
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| (adjective) of questionable honesty or legality | - |
| (adjective) not as expected | Synonyms: fishy, funny, suspect, suspicious |
| (adjective) filled with shade | Synonyms: shadowed, shadowy, umbrageous |
| sleepyheaded | (adjective) ready to fall asleep | Synonyms: sleepy-eyed, sleepy |
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| softheaded | (adjective) foolish; totally unsound | Synonyms: crazy, half-baked, screwball |
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| sporadic | (adjective) recurring in scattered and irregular or unpredictable instances | - |
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| spread | (adjective) distributed or spread over a considerable extent | Synonyms: dispersed |
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| (adjective) fully extended in width | Synonyms: outspread |
| (adjective) prepared or arranged for a meal; especially having food set out | - |
| steadfast | (adjective) firm and dependable especially in loyalty | Synonyms: staunch, unswerving |
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| (adjective) marked by firm determination or resolution; not shakable | Synonyms: firm, steady, stiff, unbendable, unfaltering, unshakable, unwavering |
| steadied | (adjective) made steady or constant | - |
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| steady | (adjective) not subject to change or variation especially in behavior | - |
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| (adjective) relating to a person who does something regularly | Synonyms: regular |
| (adjective) marked by firm determination or resolution; not shakable | Synonyms: firm, steadfast, stiff, unbendable, unfaltering, unshakable, unwavering |
| (adjective) securely in position; not shaky | - |
| (adjective) not liable to fluctuate or especially to fall | Synonyms: firm, unfluctuating |
| (adjective) not easily excited or upset | - |
| steadying | (adjective) causing to become steady | - |
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| thickheaded | (adjective) (used informally) stupid | Synonyms: blockheaded, boneheaded, duncical, duncish, fatheaded, loggerheaded, thick-skulled, thick, wooden-headed |
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| thickspread | (adjective) covered thickly | - |
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| threadbare | (adjective) repeated too often; overfamiliar through overuse | Synonyms: banal, commonplace, hackneyed, old-hat, shopworn, stock, timeworn, tired, trite, well-worn |
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| (adjective) having the nap worn away so that the threads show through | - |
| threaded | (adjective) (of bolts or screws) having screw threads | - |
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| threadlike | (adjective) thin in diameter; resembling a thread | Synonyms: filamentlike, filamentous, filiform, thready |
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| thready | (adjective) forming viscous or glutinous threads | Synonyms: ropey, ropy, stringy |
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| (adjective) thin in diameter; resembling a thread | Synonyms: filamentlike, filamentous, filiform, threadlike |
| toadyish | (adjective) attempting to win favor from influential people by flattery | Synonyms: bootlicking, fawning, obsequious, sycophantic |
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| (adjective) attempting to win favor by flattery | Synonyms: bootlicking, fawning, sycophantic |
| towheaded | (adjective) of hair color; whitish | Synonyms: ash-blonde, platinum-blonde |
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| trademarked | (adjective) (of goods and merchandise) labeled with proprietary (and legally registered) identification guaranteeing exclusive use | - |
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| traditional | (adjective) consisting of or derived from tradition | - |
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| (adjective) pertaining to time-honored orthodox doctrines | - |
| traditionalist | (adjective) stubbornly conservative and narrow-minded | Synonyms: hidebound |
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| traditionalistic | (adjective) adhering to tradition especially in cultural or religious practices | - |
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| tribadistic | (adjective) of female homosexual behavior that attempts to simulate heterosexual behavior | - |
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| unadaptable | (adjective) not adaptable | - |
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| unadapted | (adjective) not having adapted to new conditions | Synonyms: unadjusted |
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| (adjective) not changed in form or character for a purpose | - |
| unaddicted | (adjective) not addicted | - |
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| unaddressed | (adjective) not addressed | - |
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| unadjustable | (adjective) not adjustable | - |
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| unadjusted | (adjective) not altered to fit certain requirements | - |
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| (adjective) not having adapted to new conditions | Synonyms: unadapted |
| unadoptable | (adjective) difficult to place in an adoptive home | - |
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| unadorned | (adjective) not decorated with something to increase its beauty or distinction | Synonyms: undecorated |
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| unadulterated | (adjective) not mixed with impurities | - |
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| (adjective) without qualification; used informally as (often pejorative) intensifiers | Synonyms: arrant, complete, consummate, double-dyed, everlasting, gross, perfect, pure, sodding, staring, stark, thorough, thoroughgoing, utter |
| unadventurous | (adjective) lacking in boldness | - |
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| unadvisable | (adjective) not prudent or wise; not recommended | Synonyms: inadvisable |
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| unadvised | (adjective) without careful prior deliberation or counsel | Synonyms: ill-advised |
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| (adjective) having received no information | - |
| unclad | (adjective) having removed clothing | Synonyms: unappareled, unattired, undressed, ungarbed, ungarmented |
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| unfading | (adjective) of an imaginary flower that never fades | Synonyms: amaranthine |
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| ungraded | (adjective) not arranged in order hierarchically | Synonyms: unordered, unranked |
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| (adjective) (of roads) not leveled or drained; unsuitable for all year travel | Synonyms: dirt |
| unheaded | (adjective) not having a heading or caption | - |
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| unladylike | (adjective) lacking the behavior or manner or style considered proper for a lady | - |
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| unleaded | (adjective) not treated with lead | Synonyms: leadless |
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| (adjective) not having leads between the lines | - |
| unloaded | (adjective) (of weapons) not charged with ammunition | - |
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| unmade | (adjective) (of a bed) not having the sheets and blankets set in order | - |
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| unpersuadable | (adjective) not susceptible to persuasion | Synonyms: unsuasible |
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| unpersuaded | (adjective) not converted | Synonyms: unconverted |
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| unread | (adjective) not informed through reading | - |
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| unreadable | (adjective) not easily deciphered | Synonyms: indecipherable, unclear, undecipherable |
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| unready | (adjective) not prepared or in a state of readiness; slow to understand or respond | - |
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| unsaddled | (adjective) with no saddle | - |
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| unshaded | (adjective) not darkened or dimmed by shade | - |
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| (adjective) (of pictures) not having shadow represented | - |
| unshadowed | (adjective) not darkened or obscured by shadow | - |
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| unsteady | (adjective) subject to change or variation | - |
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| (adjective) not firmly or solidly positioned | Synonyms: unfirm |
| untraditional | (adjective) not conforming to or in accord with tradition | Synonyms: nontraditional |
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| widespread | (adjective) distributed over a considerable extent | Synonyms: far-flung |
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| (adjective) widely circulated or diffused | - |
| workaday | (adjective) found in the ordinary course of events | Synonyms: everyday, mundane, quotidian, routine, unremarkable |
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| wrongheaded | (adjective) obstinately perverse in judgment or opinion | - |
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