harsh

Synonyms: acrid asperous astringent bitter bleak cacophonous caterwauling clashing coarse cracked craggy creaking croaking disagreeing discordant dissonant disturbing earsplitting flat glaring grating grim guttural hard hoarse incompatible jagged jangling jarring noisy not smooth off-key out-of-key out-of-tune rasping raucous rigid rugged rusty screeching severe sharp sour strident stridulous tuneless uneven unlevel unmelodious unmusical unrelenting

Antonyms: easy gentle mild peaceful pleasing smooth soft

Synonyms: austere bitter brutal comfortless cruel cussed discourteous dour grim gruff hairy hard hard-boiled hard-nosed hard-shell mean pitiless punitive relentless rude ruthless severe sharp stern stringent tough uncivil unfeeling ungracious unkind unpleasant unrelenting wicked

Antonyms: courteous kind nice polite