Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of, relating to, or suitable for a child or childhood: a high, childish voice; childish nightmares.
  • adj. Marked by or indicating a lack of maturity; puerile: tired of your childish pranks.
  • adj. Not complicated; simple.
  • adj. Affected mentally by old age; senile.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Of or suitable for a child.
  • adj. Behaving immaturely.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Of, pertaining to, befitting, or resembling, a child.
  • adj. Puerile; trifling; weak.

from The Century Dictionary and Cyclopedia

  • Of or belonging to a child or to childhood: as, “sweet childish days,” Wordsworth, To a Butterfly.
  • Like or characteristic of a child or what is peculiar to childhood; especially, in disparaging use, trifling, puerile, silly, weak, etc.: as, childish amusements; childish fear.
  • Synonyms Childlike, Infantile, etc. See childlike.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. indicating a lack of maturity

Etymologies

child +‎ -ish (Wiktionary)

Examples

  • Marco Reininger, a veteran and political science major at Columbia, wrote on The Huffington Post that, despite what he called the childish catcalls that greeted Maschek, the institution as a whole is neither as elitist nor as condescending as the media firestorm suggests.

    ROTC's return to universities a bumpy road

  • With tear-filled eyes, my younger siblings and I waved goodbye as one by one the older kids deserted us and what they termed our childish ways.

    Chicken Soup for the Soul: Living Catholic Faith

  • Percy, who disapproved of what he termed their childish behavior, didn't spend much time in the Gryffindor common room.

    Harry Potter and the Chamber of Secrets

  • At a private meeting at which only he, Ibn Sa'ud and I were present, he lost all patience over what he called the childish attitude of Ibn Sa'ud in his tribal boundary idea.

    The Gulf War Reconsidered

  • Both have, however, one common ground on which they become indistinguishable, -- that region of the supernatural which is most primitive and most vague; and the closest relation between the savage and the civilized fancy may be found in the fears which we call childish, -- of darkness, shadows, and things dreamed.

    Two Years in the French West Indies

  • Certainly the French father might have followed the custom of his class and country, and coerced his young daughter into the acceptance of any husband he might have chosen for her; but he did not feel disposed to use harsh measures with his only and idolized child; he rather preferred to exercise patience and forbearance toward her, until she should have outlived what he called her childish caprices.

    The Lost Lady of Lone

  • He'd like to use the word "childish" but feels it's too harsh.

    The Globe and Mail - Home RSS feed

  • Blagojevich also apologized to his family, his brother, and for his "self-absorbed behavior," which he called "childish and petty."

    The Full Feed from HuffingtonPost.com

  • He knew the penetration of the Marquis was not to be imposed on by such a story to account for his swelled forehead as he had just told to Philippo, and he was well aware that that nobleman, guessing that he had met with the accident in the pursuit of some plan prompted by what he called a childish curiosity, would take occasion to point the severest ridicule against its indulgence.

    Villasantelle; or the Curious Impediment

  • To have such a wonderful power and be so childish is absolutely crazy.

    'Heroes' recap: Oh Mohinder, You've Done It Again! | EW.com

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