3 letters:
coy, gay, hot, sad

4 letters:
awed, bare, base, cagy, cold, cool, dark, dead, demo, dour, fair, glad, glum, good, gray, grey, hoar, hold, jeer, kind, live, mean, naif, neat, plat, plot, rota, sour, wild, worn

5 letters:
adept, aging, alert, angry, bowed, broad, cagey, canny, carry, craps, cruel, drawn, eager, fetus, godly, happy, heavy, hoary, irate, jolly, kinky, level, mercy, merry, moody, naive, nervy, noble, pious, pluck, proof, ratty, riant, scoff, smart, sound, stale, stony, tatty, timid, years

6 letters:
abject, absent, abulic, adroit, ageing, awless, blithe, bowing, bubbly, caring, casual, chesty, clever, clumsy, degage, drowsy, expert, feisty, flinty, foetus, gentle, gifted, guilty, hearty, heroic, humane, ireful, jocund, jovial, kindly, lordly, loving, mighty, morose, phlegm, plucky, polite, raging, replay, scatty, shabby, shamed, sniffy, soigne, spunky, stable, static, stemma, sullen, svelte, ticket, toothy, uneasy, unfair, unkind, unwise, urbane, veined, venose, wanted, zodiac

7 letters:
aboulic, adoring, anxious, artless, aweless, beastly, bestial, boxcars, bravery, brutish, careful, come on, content, cordial, courage, cunning, default, defined, diagram, envious, erudite, estrous, fearful, forlorn, furious, grizzly, growing, guiding, haggard, hangdog, haughty, haunted, healthy, helpful, jealous, jeering, labored, languor, leading, learned, leering, liberal, mockery, nervous, partial, pensive, pent-up, premier, profile, prudent, raddled, refined, release, show up, skilful, skilled, slashed, soignee, surface, tactful, tearful, turn up, uniform, unquiet, valiant, weeping, wistful

8 letters:
adjusted, admiring, arrogant, bloomers, bungling, cadaster, cadastre, careless, careworn, cautious, cheerful, christly, civility, come out, covetous, deferent, detached, devilish, diabolic, disloyal, dolorous, empathic, exploded, fatherly, flippant, frowning, fumbling, grateful, guidance, hammered, immodest, laboured, landmark, lethargy, listless, lovebird, lukewarm, merciful, militant, mirthful, name tag, negative, obdurate, obliging, obsessed, one-eyed, oscitant, outlined, penalize, polished, positive, precious, premiere, prideful, profound, residual, resigned, reverent, road map, scoffing, selfless, sensible, sheepish, skillful, spiteful, steering, suppress, tactless, talented, tasteful, thankful, thriving, tireless, tolerant, valorous, veinlike

9 letters:
androgyny, apathetic, awestruck, battleful, bellicose, bottle up, bryophyta, caressing, caressive, cherished, combative, concerned, conjugate, contented, contrived, credulous, delimited, desperate, diffident, dignified, directing, directive, dolourous, drunkenly, favorably, glowering, gutsiness, honorable, honorific, impartial, inclement, incurious, indicator, indulgent, inflected, ingenious, invidious, in awe of, jaundiced, litigious, maternity, merciless, observant, observing, perverted, practiced, price tag, promising, purposive, rancorous, regardful, religious, repressed, revealing, saturnine, statement, stillborn, tactfully, technical, thankless, treasured, unhelpful, unhopeful, unskilled, untactful, unvarying, well-worn, wind rose

10 letters:
abstracted, aggressive, altruistic, benevolent, charitable, christlike, clock dial, clock face, despiteful, diabolical, dilettante, discontent, disdainful, dismissive, dispirited, effortless, empathetic, endearment, favourably, forbearing, honourable, interested, irreverent, lachrymose, mitigation, moth-eaten, neglectful, neoliberal, patient of, penitently, phlegmatic, pluckiness, politeness, possessive, proficient, protective, quickening, reasonable, red-handed, resolutely, responsive, reversible, senescence, shamefaced, smoldering, snake eyes, solicitous, star chart, submissive, swaggering, thoughtful, unblinking, unchanging, unflagging, ungrateful, uninvolved, unmerciful, unthankful, unwavering, unwearying, vindictive, worshipful

11 letters:
awestricken, benefaction, benevolence, bisexuality, competitive, complaisant, concernedly, considerate, contentious, deferential, directional, disputative, distrustful, extenuation, flourishing, gray-haired, gray-headed, grey-haired, grey-headed, half-length, halfhearted, inattentive, incompetent, indifferent, injudicious, inquisitive, intelligent, levelheaded, longanimous, maladaptive, naval chart, penitential, pilot chart, preoccupied, questioning, repentantly, smouldering, speculative, sympathetic, tempestuous, thallophyte, thoughtless, uncertainly, unemotional, unexpansive, unfavorably, unpatriotic, water level, weather map

12 letters:
absentminded, appreciative, differential, dilettantish, discontented, discourteous, disputatious, distribution, enthusiastic, illustration, inclinometer, intolerantly, large-minded, light-minded, meanspirited, motherliness, phlegmatical, self-assured, sensibleness, sluggishness, specialistic, supercilious, thoughtfully, undiplomatic, unfavourably, uninterested, unreasonable, white-haired, with concern

13 letters:
action replay, block diagram, circumscribed, compassionate, demonstration, dialect atlas, dilettanteish, disrespectful, indefatigable, irresponsible, large-hearted, penitentially, short subject, superstitious, thoughtlessly, weather chart

14 letters:
courageousness, disapprovingly, discriminating, discriminatory, inconsistently, parry's pinyon, pinus parryana, self-confident, self-forgetful, self-important

15 letters:
account payable, dormant account, exemplification, hermaphroditism, mephistophelean, mephistophelian, public-spirited, self-respectful, self-respecting

16 letters:
linguistic atlas, maternal quality, vertical section

17 letters:
empirical formula, pinus quadrifolia

18 letters:
division bryophyta, navigational chart, organization chart, population profile, structural formula, unenthusiastically

19 letters:
financial statement, functional disorder

20 letters:
characteristic curve, reductio ad absurdum

21 letters:
sinusoidal projection

23 letters:
partnership certificate

26 letters:
proprietorship certificate

27 letters:
sanson-flamsteed projection