(a.) Incongruous.

acrid adversary adversative adverse adversive ajar alien antagonistic anti antipathetic antithetic antonymous at cross-purposes balancing belligerent bitter breakaway caustic clashing colliding compensating competitive con confronting confused contradicting contradictory contradistinct contrapositive contrarious contrary contrasted converse counter counteractant counteracting counteractive counterbalancing counterpoised countervailing counterworking cranky cross crotchety dead against despiteful detrimental differing difficult disaccordant disagreeing disconsonant discordant discrepant disharmonious dissentient dissident dissonant enemy eyeball to eyeball fractious full of hate grating hard harmful harsh hateful hostile in opposition incompatible incongruent incongruous inconsistent inharmonious inimical inverse jangling jangly jarring jostling malevolent malicious malignant miserable negative nonconformist noncooperative not easy obstinate obverse off-color off-tone opponent opposed opposing opposite oppositional oppositive oppugnant out of accord overthwart perverse quarrelsome rancorous reactionary recalcitrant refractory renitent repugnant resistant reverse revolutionary rigorous rival set against sinister sore spiteful squared off stressful troublesome troublous trying uncooperative unfavorable unfriendly unharmonious unpropitious untoward venomous virulent vitriolic warring wretched