Adjective vernal has 2 senses
  1. youthful, vernal - suggestive of youth; vigorous and fresh
    Antonym: old (indirect, via young)
  2. vernal - of or characteristic of or occurring in spring; "the vernal equinox"
    Antonyms:
    summery, aestival, estival, autumnal, wintry, wintery, brumal, hibernal, hiemal
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