touchy

hypersensitive, oversensitive, sensitive, supersensitive, tender

choleric, crabby, cranky, cross, cross-grained, crotchety, grouchy, grumpy, irascible, irritable, peevish, perverse, pettish, petulant, prickly, quick-tempered, raspy, ratty, short-tempered, snappish, snappy, snarky, snippety, snippy, stroppy [British], stuffy, testy, waspish

bearish, bilious, cantankerous, curmudgeonly, disagreeable, dyspeptic, ill-humored, ill-natured, ill-tempered, ornery, querulous, surly

abstract, abstruse, complex, complicated, hard, intricate, involved, recondite, serious

problem, scabrous, stubborn, troublesome, troublous, vexatious, vexing, worrisome

burdensome, demanding, discommoding, exacting, exhausting, importunate, inconvenient, onerous, oppressive, painful, stressful

explosive, incendiary