Definition of infantile in US English:



  • 1Of or occurring among babies or very young children.

    ‘infantile colic’
    • ‘The classification as infantile or juvenile forms depends on the amount of renal disease present.’
    • ‘The staff that was there, we were all crying and we checked the babies out because we're all certified in infantile first aid and CPR.’
    • ‘There are plenty of bright shiny colors to keep baby's infantile brain firing on all ten billion synapses until the juice box kicks in.’
    • ‘The crossover design is unlikely to provide valid evidence because infantile colic is an unstable condition, and the effects of dicyclomine may continue even after a washout period.’
    • ‘Curves of this magnitude usually have an infantile or juvenile onset rather than an adolescent onset.’
    • ‘There is no evidence that simethicone works for infantile colic.’
    • ‘An association between infantile colic and later development of asthma or allergic disease has not been shown.’
    1. 1.1derogatory Childish.
      ‘infantile jokes’
      • ‘We are the laughing stock of Europe with our ridiculously high prices for everything and our stupid infantile government.’
      • ‘He was infantile, narcissistic, driven, unreasonable and, at times, brilliantly irrational.’
      • ‘Perhaps it's because the present makes those old visions of the future look infantile and silly.’
      • ‘From this recent example one can see Beijing's infantile, ridiculous and thuggish attitude.’
      • ‘There is Pricey, an infantile young woman who cares for her rag doll child as if it was alive.’
      • ‘These films are derivative, infantile and suffused with a culture of complaint and delusions of suburban grandeur; and, strangely dated.’
      • ‘It is curious, and probably mildly infantile, that we find the notion of people with opinions so alarming, particularly as other countries appear to manage perfectly well with them.’
      • ‘Better a cheap and infantile joke than no joke at all, or so I thought.’
      • ‘Alternatively, he may just be a weird and infantile man who keeps a diary.’
      • ‘Whenever it's time to jack up the joke factor, they become loud, piggish, and infantile.’
      • ‘It's a terrible, infantile longing for really childish flavours.’
      • ‘If so, ‘sadly one would have to conclude that the masses are not yet mature enough to give up their infantile fantasies.’’
      • ‘In response to one writer, I don't think profanity ‘showcases his infantile vocabulary.’’
      • ‘The tragic end that awaits these characters is the result of an infantile lack of communication, which thrives in the high school environment of exaggeration and gossip.’
      • ‘These beauties spend their time exchanging infantile jokes suitable for the playground.’
      • ‘Now I realise that it's been there all along, with its stupid, slobbering tongue and its vacuous, infantile grin.’
      • ‘And if that sounds like the politics of the playground, it's made all the more infantile because in many ways Cuba has plenty of things that America would dearly love and needs.’
      • ‘The criticism traditionally heaped upon science fiction and fantasy - that they are infantile and escapist genres - has always been fairly risible.’
      • ‘They stretched juvenile situations until they were infantile.’
      • ‘But theirs is not the only movement with infantile fantasies.’
      childish, babyish, immature, puerile, juvenile, adolescent
      View synonyms


Late Middle English: from French, or from Latin infantilis, from infans, infant- (see infant).