Antonyms of adj skittish

1 sense of skittish

Sense 1
skittish, flighty, spooky, nervous -- (unpredictably excitable (especially of horses))

INDIRECT (VIA excitable) -> unexcitable -- (not easily excited; "an unexcitable temperament")

Similarity of adj skittish

1 sense of skittish

Sense 1
skittish, flighty, spooky, nervous -- (unpredictably excitable (especially of horses))
       => excitable (vs. unexcitable) -- (easily excited)