noun
deceit
di-SEET/dɪˈsiːt/
Dishonest behavior intended to mislead someone.
His hidden extra ace reveals deceit during the card game.

Etymology
The underlying image is of “taking in” or ensnaring someone, with de- meaning “from” or adding a negative force. Deceit names the trickery or misleading behavior involved.
In context
THIS IS AN UNLIKELY PAIR CAUGHT UP IN A WEB OF LIES AND DECEIT. SHE HAD EVERYONE FOOLED.
More examples
- She uncovered the deceit.
- The plan depended on deceit.
- They condemned his deceit.
Forms
deceit
deceitful adjective — deliberately misleading
Similar words
- deception
- The broader act of misleading.
- dishonesty
- Includes other failures of truthfulness besides deliberate misleading.