Antonyms of adj good-natured

1 sense of good-natured

Sense 1
good-natured (vs. ill-natured) -- (having an easygoing and cheerful disposition; "too good-natured to resent a little criticism"; "the good-natured policeman on our block"; "the sounds of good-natured play")

ill-natured (vs. good-natured) -- (having an irritable and unpleasant disposition)
        => atrabilious, bilious, dyspeptic, liverish -- (irritable as if suffering from indigestion)
        => bristly, prickly, splenetic, waspish -- (very irritable; "bristly exchanges between the White House and the press"; "he became prickly and spiteful"; "witty and waspish about his colleagues")
        => cantankerous, crotchety, ornery -- (having a difficult and contrary disposition; "a cantankerous and venomous-tongued old lady"- Dorothy Sayers)
        => choleric, irascible, hotheaded, hot-tempered, quick-tempered, short-tempered -- (quickly aroused to anger; "a hotheaded commander")
        => churlish -- (having a bad disposition; surly; "churlish as a bear"- Shakespeare)
        => crabbed, crabby, cross, fussy, grouchy, grumpy, bad-tempered, ill-tempered -- (annoyed and irritable)
        => cranky, fractious, irritable, nettlesome, peevish, peckish, pettish, petulant, scratchy, testy, tetchy, techy -- (easily irritated or annoyed; "an incorrigibly fractious young man"; "not the least nettlesome of his countrymen")
        => crusty, curmudgeonly, gruff, ill-humored, ill-humoured -- (brusque and surly and forbidding; "crusty remarks"; "a crusty old man"; "his curmudgeonly temper"; "gruff manner"; "a gruff reply")
        => currish -- (resembling a cur; snarling and rude)
        => dark, dour, glowering, glum, moody, morose, saturnine, sour, sullen -- (showing a brooding ill humor; "a dark scowl"; "the proverbially dour New England Puritan"; "a glum, hopeless shrug"; "he sat in moody silence"; "a morose and unsociable manner"; "a saturnine, almost misanthropic young genius"- Bruce Bliven; "a sour temper"; "a sullen crowd")
        => disagreeable -- (unpleasant to interact with; "a disagreeable old man")
        => huffish, sulky -- (sullen or moody)
        => misanthropic, misanthropical -- (hating mankind in general)
        => misogynous, misogynistic -- (hating women in particular)
        => shirty, snorty -- ((British informal) ill-tempered or annoyed)
        => shrewish, nagging -- (continually complaining or faultfinding; "a shrewish wife"; "nagging parents")
        => snappish, snappy -- (apt to speak irritably; "a snappish tone of voice")
        => spoiled, spoilt -- (having the character or disposition harmed by pampering or oversolicitous attention; "a spoiled child")
        => surly, ugly -- (inclined to anger or bad feelings with overtones of menace; "a surly waiter"; "an ugly frame of mind")
        => vinegary, vinegarish -- (having a sour disposition; ill-tempered)

Similarity of adj good-natured

1 sense of good-natured

Sense 1
good-natured (vs. ill-natured) -- (having an easygoing and cheerful disposition; "too good-natured to resent a little criticism"; "the good-natured policeman on our block"; "the sounds of good-natured play")
       => amiable, good-humored, good-humoured -- (disposed to please; "an amiable villain with a cocky sidelong grin"- Hal Hinson)
       => equable, even-tempered, good-tempered, placid -- (not easily irritated; "an equable temper"; "not everyone shared his placid temperament"; "remained placid despite the repeated delays")
          Also See-> kind#1; pleasant#1; agreeable#1