1. given to or characterized by deception or falsehood or divergence from absolute truth

2.  someone who tells lies

3. dishonest, lying; untruthful

A mendacious person is one who tells lies habitually and intentionally.

– Vocabulary Dictionary

Part of Speech (POS):


Why is it important to know a word’s part of speech?

Answer: Understanding the different parts of speech is important for understanding how words work and how words can and should be joined to make sentences that are grammatically correct.

Synonyms for the word Mendacious:

Remember, a synonym is a word or phrase that has the exact or near exact same definition as another word or phrase.

• dishonest

• lying

• untruthful

Other word forms of Mendacious

mendaciously = adverb

mendaciousness = noun

Why is knowing various forms of a word important?


Knowing the various forms of a word allows the writer to use a word they like in many ways. This allows for creativity and varied sentence structure, which are important to writing well.

Below are forms of mendacious used correctly in different sentence types:

• Because Marcus is perfidious and mendacious, his fiancée Melinda called off their engagement. (Complex Sentence)

• Marcus’ disingenuous comments and mendaciousness was obvious to all of his colleagues, so his supervisor fact-checked all the inventory reports he submitted.  (Compound Sentence).

• Although still legally married, Marcus mendaciously deceived the prepossessing young woman and he somehow convinced her to go out on a date with him. (Compound-Complex Sentence)

• “One day Marcus will learn that mendacious people never succeed in life,” said his ex-fiancée Melinda. (Simple Sentence)

In the above examples, we have provided the four English sentence types as examples to give you a visual of how each sentence type should be structured.


1. Write three complex sentences using the word mendacious.

A complex sentence is a sentence that contains one independent and at least one dependent clause.

An independent clause is a complete thought that can stand alone as a sentence.

A dependent clause is not a complete thought. It is a sentence that depends on the independent clause.

2. Write two compound sentences using the word mendacious.

A compound sentence is a sentence containing two or more independent clauses joined by a coordinating conjunction or semicolon.

3. Write four simple sentences using both the  adverb and noun word forms for mendacious.

4. After proofreading your sentences, type them into the Leave a Reply/Leave a Comment section below (keep scrolling down).

5. Please review The 4 Types of Sentences workshop in our Basic Rules of Grammar category. At the very bottom of this page you will find a search bar section where you can type in the words The 4 Types of Sentences to find the workshop and other helpful workshops.

A member of our teaching staff will provide helpful feedback for the sentences you provide in the comment section below. If you have any questions related to this workshop, please feel free to post those as well.

Writing Tip: Use the word during a conversation today. The more you familiarize yourself with this word by consistently incorporating it into your vocabulary and writing, the easier it will be to remember the word.

We hope you enjoyed this reading and writing workshop.

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