Adulterate: contaminate, dilute, degrade
Apathy: indifference, unconcern, lethargy
Blithe: cheerful, lighthearted, carefree
Coalesce: combine, merge, fuse
Cosmopolitan: urbane, global, worldly
Desultory: haphazard, erratic, random
Dour: harsh, grim, stern
Equivocal: uncertain, dubious, ambiguous
Expeditious: prompt, swift, efficient
Impeccable: immaculate, unblemished, flawless
Inimitable: unparalleled, peerless, unique
Mortify: embarrass, chagrin, humiliate
Obdurate: obstinate, inflexible, stubborn
Parsimonious: miserly, cheap, stingy
Pastiche: potpourri, mélange, imitation
Profane: blasphemous, unholy, irreverent
Pugnacious: belligerent, argumentative, combative
Soporific: drowsy, calming, sleep-inducing
Supercilious: condescending, disdainful, haughty
Trite: clichéd, stale, banal