mendacious
A mendacious person is one who tells lies habitually and intentionally. Don't get stuck at the water cooler or bus stop next to someone you consider mendacious!
People may tell "white lies" if they forgot your birthday or really don't like your new haircut, but if you catch someone intentionally manipulating you with a falsehood, that person is just plain mendacious. So think of the most deceptive, insincere, perfidious, duplicitous, false person you've ever met, and then add the word mendacious to that list.
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given to lying“a mendacious child”synonyms:untruthfulnot expressing or given to expressing the truth
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intentionally untrue“a mendacious statement”synonyms:falsenot in accordance with the fact or reality or actuality
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Vocabulary lists containing mendacious
You'd be a fool not to learn these words related to pranks, jokes, and deceit. For more on the history of these words, read The Cunning, Risible Holiday of April Fool's Day.
Looking to build your vocabulary? Then practice this list of 300 "hard words" — the kind that used to be tested on the SAT before 2016. If you're a high school student prepping for the SAT, check out Vocabulary.com's Roadmap to the SAT, which focuses on the vocabulary you'll need to ace today's SAT test.
From insincere displays of emotion to falsely labeled products to outright lies, there are unfortunately a lot of ways to be dishonest or fake. For more synonym lists, explore our Say What You Mean resources.