formal
1
: not honest : likely to tell lies
a mendacious businessman
2
: based on lies
The newspaper story was mendacious and hurtful.
a mendacious political campaign
Cite this Entry
“Mendacious.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/mendacious. Accessed 20 Jun. 2026.
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