brace, climb, closed, croup, cut, deep, fix, he, head, heaves, hole, jam, load, mess, nerve, pass, plight, poise, queer, slur, steel, strait, straits, stunt, tight, tough, trap, trek, trudge, wall, warn

abstruse, appear, awkward, backup, bedim, benight, bitter, bright side, burden, choosey, choosy, clumsy, conduct, conquest, cover, cross-grained, cumbrous, design, evade, expose, extort, fill-in, fractious, gristly, hardness, hidden, hot seat, kernel, millstone, mucus, muddle, nasty, niceness, obscure, occult, onus, op art, peril, pickle, pilot, poser, rattrap, relief, riddle, roadblock, rugged, scupper, sightsing, snorter, stand-in, sticker, stiffened, stubborn, stumper, subtle, succor, succour, tackle, tactless, talla, toughie, whiteout, wring from

abstrusely, alpinist, arduous, backup man, balancer, barrier, big business, brain-teaser, broken wind, bunglesome, cabalist, casual, conundrum, crotchety, cumbersome, dauntingly, delicate, double dutch, dyspnea, dyspnoea, elusive, encumbrance, endanger, enigma, enticing, go about, groundcover, ground cover, helium, impeded, incumbrance, in the lurch, kabbalist, mulishness, obstinance, obstructer, obstruction, obstructor, on the spot, ornery, profiteer, quandary, recondite, relegate, reliever, resourceful, rubbery, stealth aircraft, stealth bomber, stealth fighter, stubbornness, substitute, subtlety, the devil, ticklish, tight money, tongue twister, troublesome, ungainly, unwieldy

approachable, bacteria, bacterium, bronchospasm, cantankerous, centromere, complicated, constipated, constipation, contrarious, convalescent, course of action, delivery, difficultness, difficulty, dysphagia, dysuria, elusiveness, embarrassing, fire-resistant, fire-resisting, fire-resistive, fire-retardant, gordian knot, hatha yoga, heavy lifting, hot potato, impediment, impossibly, infrangible, intractable, irregular, kettle of fish, ladies' slipper, lady's slipper, lady-slipper, mumbo jumbo, negociate, obstinacy, predicament, resourcefulness, silver bullet, silver lining, slipper orchid, solomonic, uncommonly, unlikable, unlikeable

cartilaginous, covering fire, discomycetes, impedimenta, imperceptible, impersonally, imponderable, indiscernible, insuperably, intelligently, mucous secretion, penal colony, perceptually, precariously, pronunciation, un-come-at-able, un-get-at-able, unadoptable, uncontrollable, undiplomatic, ungetatable, unmalleable, unmanageable, unperceivable, unpronounceable, unputdownable, unutterable

alternative pleading, incomprehensible, indigestibleness, inextinguishable, invincibility, irregularity, mission impossible, uncomprehensible

indigestibility, indomitability, myotonic dystrophy, spasmodic laryngitis, subclass discomycetes