Antonyms of adj irascible

2 senses of irascible

Sense 1
choleric, irascible, hotheaded, hot-tempered, quick-tempered, short-tempered -- (quickly aroused to anger; "a hotheaded commander")

INDIRECT (VIA ill-natured) -> good-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")

Sense 2
choleric, irascible -- (characterized by anger; "a choleric outburst"; "an irascible response")

INDIRECT (VIA angry) -> unangry -- (not angry)

Similarity of adj irascible

2 senses of irascible

Sense 1
choleric, irascible, hotheaded, hot-tempered, quick-tempered, short-tempered -- (quickly aroused to anger; "a hotheaded commander")
       => ill-natured (vs. good-natured) -- (having an irritable and unpleasant disposition)

Sense 2
choleric, irascible -- (characterized by anger; "a choleric outburst"; "an irascible response")
       => angry (vs. unangry) -- (feeling or showing anger; "angry at the weather"; "angry customers"; "an angry silence"; "sending angry letters to the papers")