Wrangle

quarrel, argue, dispute, brawl, contest, bicker, debate, fight, struggle, squabble, cavil

agree, accept, cooperate, concur

Playful

sportive, gay, jolly, frisky, prankish, sprightly, roguish, lively, frolicsome, mischievous

dull, morose, listless, sullen, humorless, sedate

Mischief

damage, evil, hurt, wrong, injury, ill, detriment, harm, grievance, outrage, affront, vandalism, annoyance, deviltry, misfortune, prank, trouble, roguery, disadvantage, disservice

good, service, benefit, profit, advantage, improvement, favor, betterment, blessing, kindness, friendship, friendliness, countenance, assistance, reparation, support, help, aid, concession, payment, good will, amity, defense, vindication

Clog

jam, choke, stop, obstruct, encumber, impede, block, hamper, congest

unblock, clear, free

Profound

deep, abysmal, mysterious, solemn, abstruse, heavy, erudite, scholarly, recondite, learned, undisturbed, heartfelt, intense, penetrating, great, consummate, enlightened, discerning, comprehensive, fathomless, serious

shallow, slight, superficial, unsettled, simple, trifling, unlearned, unenlightened, absurd, frivolous, fatuous

Quixotic

chimerical, fantastic, visionary, fanciful, imaginary, mad, wild, romantic, sentimental, idealistic, abstract

Not these
(My Instant Synonyms and Antonyms gave no antonyms for quixotic.)

Miraculous

supernatural, wonderful, prodigious, marvelous, extra-ordinary, curious, spectacular, outstanding, unusual, surprising, stupendous, preternatural, wondrous, astonishing, incredible, unbelieveable, strange, bewildering, overwhelming, astounding, indescribable, amazing, inexpressible, inexplicable, unimaginable, fearful, stupefying, awesome

common, ordinary, usual, commonplace, everyday, unimportant, expected, prosaic, matter-of-fact, trivial, habitual, prevalent, general, customary, trifling, regular, frequent, petty, natural, formal, insignifigant, normal

Audacity

boldness, rashness, presumption, arrogance, effrontery, impudence, brazeness

meekness, mildness, gentility, forbearance, restraint, timidity, humility

Wicked

iniquitous, sinful, erring, nefarious, wayward, dissolute, vile, vicious, unrighteous, wrong, criminal, disorderly, immoral,disreputable, impure, evil, corrupt, malevolent, shameful, base, scandalous, foul, infamous, gross, villainous, atrocious, unholy, irreligious, fiendish.

good, innocent, spotless, decent, noble, virtuous, worthy, chaste, undefiled, unsullied, righteous, upright, exemplary, pure, praiseworthy, meritorious, commendable, laudable, deserving, well-intentioned, excellent, admirable.

Inept

awkward, unhandy, inappropriate, maladroit, clumsy, unfit, foolish

apt, adroit, competent, fit, skillful, able, suitable