deceitfulness

UK: /dɪˈsiːtʃʊlnɪs/

WordReference Random House Learner's Dictionary of American English © 2025

de•ceit•ful /dɪˈsitfəl/   adj. 

1. given to deceiving:
   Her saying one thing and doing another shows how deceitful she is.
2. intended to deceive;
   misleading:
   a deceitful action.

de•ceit•ful•ly, adv. 
de•ceit•ful•ness, n. 

[uncountable] We found evidence of his deceitfulness.

WordReference Random House Unabridged Dictionary of American English © 2025

de•ceit•ful  (di sēt′fəl), adj. 

1. given to deceiving:
   A deceitful person cannot keep friends for long.
2. intended to deceive;
   misleading;
   fraudulent:
   a deceitful action.

• 1400–50; late Middle English; see deceit, -ful

de•ceit′ful•ly, adv. 
de•ceit′ful•ness, n. 
Synonyms

• 1. . insincere, disingenuous, false, hollow, designing, tricky, wily.
• 2. . illusory, fallacious.

Antonyms

• 1. . honest.
• 2. . genuine.