Antonyms of adj autumnal

2 senses of autumnal

Sense 1
autumnal (vs. wintry) (vs. vernal) (vs. summery) -- (of or characteristic of or occurring in autumn; "the autumnal equinox"; "autumnal fruits")

wintry (vs. vernal) (vs. summery) (vs. autumnal), wintery -- (characteristic of or occurring in winter; "suffered severe wintry weather"; "brown wintry grasses")
        => brumal, hibernal, hiemal -- (characteristic of or relating to winter; "bears in brumal sleep")
        => winter-blooming, winter-flowering -- (of plants that bloom during the winter)
vernal (vs. summery) (vs. autumnal) (vs. wintry) -- (of or characteristic of or occurring in spring; "the vernal equinox")
        => spring-flowering, early-flowering, spring-blooming, early-blooming, late-spring-blooming -- (of plants that bloom during the spring)
summery (vs. autumnal) (vs. wintry) (vs. vernal) -- (belonging to or characteristic of or occurring in summer; "summery weather"; "summery dresses")
        => aestival, estival -- ((rare) of or occurring in summer; "the sky was a burnished aestival blue"; "estival winds")
        => summer-flowering, summer-blooming -- (of plants that bloom during the summer)

Sense 2
autumnal -- (characteristic of late maturity verging on decline; "a serene autumnal mood")

INDIRECT (VIA mature) -> immature -- (characteristic of a lack of maturity; "immature behavior")

Similarity of adj autumnal

2 senses of autumnal

Sense 1
autumnal (vs. wintry) (vs. vernal) (vs. summery) -- (of or characteristic of or occurring in autumn; "the autumnal equinox"; "autumnal fruits")
       => autumn-flowering, autumn-blooming, fall-flowering, fall-blooming, late-flowering, late-blooming -- (of plants that bloom during the autumn)
       => late-ripening -- (of plants that ripen in the fall)

Sense 2
autumnal -- (characteristic of late maturity verging on decline; "a serene autumnal mood")
       => mature (vs. immature) -- (characteristic of maturity; "mature for her age")