Definify.com

Webster 1913 Edition

(?; 277)

Adj.

[Cf. F.

enfantin

Infantile; childish.

A degree of credulity next

infantine

Burke.

Adj.

Pertaining to infants or to young children.

infantine ‎(comparative more infantine, superlative most infantine)

Infantile; childish.
- 1840, Edgar Allan Poe, ‘The Colloquy of Monos and Una’:
  Man, because he could not but acknowledge the majesty of Nature, fell into childish exultation at his acquired and still-increasing dominion over her elements. Even while he stalked a God in his own fancy, an infantine imbecility came over him.