puerile Antonyms

been around akamai ageing older age-old fully grown sophisticated smart serious senior ripened ripe full-fledged fully fledged in one's prime advanced in years awfully clever as tricky as a monkey as sly as a fox as cunning as a fox as cunning as a cartload of monkeys as clever as a wagonload of monkeys as clever as a cartload of monkeys agile enough over the hill paternal parental antique antiquated antediluvian ancient ancestral anachronistic agile ageless aging aged advanced clever dotard old matured mature marriageable grown gravid full-grown full-blown elderly elder