Definitions

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

  • adj. Capable of being shaped or formed, as by hammering or pressure: a malleable metal.
  • adj. Easily controlled or influenced; tractable.
  • adj. Able to adjust to changing circumstances; adaptable: the malleable mind of the pragmatist.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Able to be hammered into thin sheets; capable of being extended or shaped by beating with a hammer, or by the pressure of rollers.
  • adj. Flexible, liable to change.
  • adj. in which an adversary can alter a ciphertext such that it decrypts to a related plaintext

from the GNU version of the Collaborative International Dictionary of English

  • adj. Capable of being extended or shaped by beating with a hammer, or by the pressure of rollers; -- applied to metals.
  • adj. Capable of being influenced to behave as desired; tractable; -- used mostly of children.

from The Century Dictionary and Cyclopedia

  • Capable of being shaped or extended by beating or rolling; capable of extension by hammering; reducible to a laminated form by beating, as gold, which may be beaten into leaves (gold-foil) of extreme thinness; hence, capable of being shaped by outside influence; yielding. See foil.

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

  • adj. capable of being shaped or bent or drawn out
  • adj. easily influenced

Etymologies

Middle English, from Old French, from Medieval Latin malleābilis, from malleāre, to hammer, from Latin malleus, hammer; see melə- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle English malliable, borrowed from Late Latin malleābilis, derived from malleāre ("to hammer"), from malleus ("hammer"), from Proto-Indo-European *mal-ni- (“crushing”), an extended variant of Proto-Indo-European *melH₂- (“crush, grind”). (Wiktionary)

Examples

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