-tfəl adjective
Etymology: Middle English desaitful, from desait, deceite deceit + -ful
1. : having a tendency or disposition to deceive : given to deception : dishonest
she was a deceitful scheming little thing — Israel Zangwill
2. : tending to deceive : deceptive , misleading
smooth, shining, and deceitful as thin ice — S.T.Coleridge
Synonyms: see dishonest