Definition of knavish in English:

knavish

adjective

archaic
  • Dishonest or unscrupulous.

    ‘his knavish tricks will be frustrated’
    • ‘One is at times reminded of Belloc's remark to the effect that the best proof of the divine foundation and support of the Church is that no institution run with such knavish imbecility could otherwise survive.’
    dishonourable, unprincipled, unscrupulous, ignoble, untrustworthy, roguish, rascally, scoundrelly, mischievous, reprobate, unregenerate, villainous, wicked, depraved, bad, immoral, fiendish, devilish
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Pronunciation

knavish

/ˈneɪvɪʃ/