Synonyms of knavish
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deceitfulIf you say that someone is deceitful, you mean that they behave in a dishonest way by making other people believe something that is not true.
• The ambassador called the report deceitful and misleading.
• Her worst fault is a strongly deceptive streak.
dishonestIf you say that a person or their behaviour is dishonest, you mean that they are not truthful or honest and that you cannot trust them.
• He had become rich by dishonest means.
deceitfulcorruptcrooked (informal)designinglyingbent (slang)falseunfaircheatingdeceivingshady (informal)fraudulenttreacherousdeceptiveunscrupulouscraftyswindlingdisreputableuntrustworthydouble-dealingunprincipledmendaciousperfidious (literary)untruthfulguilefulknavish (archaic)
Thesaurus for knavish from the Collins English Thesaurus