Definitions

sincere

[sin-seer] / sɪnˈsɪər /

ADJECTIVE

straightforward, honest

Synonyms

STRONGEST

candid earnest for real forthright genuine heartfelt outspoken real serious true trustworthy

WEAK

24-carat aboveboard actual artless bona fide dead-level dear devout faithful frank guileless honest-to-God honest-to-goodness like it is meant natural no-fooling no-nonsense on the level on the line on the up and up open plain pretensionless regular righteous saintly square sure-enough true-blue unaffected undesigning undissembled unfeigned unpretentious up-front wholehearted

Antonyms

STRONGEST

counterfeit deceitful devious dishonest false flippant insincere invalid untrustworthy

WEAK

tricky

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Rossini’s devotion, undoubtedly sincere, was never permitted to cloud his humor.

From The Wall Street Journal • May 15, 2026

As historian Rick Perlstein related in “Nixonland: The Rise of a President and the Fracturing of America,” Nixon’s anti-communist agit-prop, honed over many decades, was sincere — but it was only part of the story.

From Salon • May 14, 2026

Blasting from my car speaker, Dr. Becky sounds sincere to the point of tearful.

From Slate • May 10, 2026

“Flowers For Men” was written from a sincere curiosity about mens’ strictures, bad influences and better aspirations.

From Los Angeles Times • May 8, 2026

Whether he is sincere, it is a little hard to say: having emphasized his belief in miracles, he proceeds to make the concept of a miracle entirely subjective only a few paragraphs later.

From "The Invention of Science" by David Wootton

Vocabulary lists containing sincere

The SAT: Words to Capture Tone, List 2

Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!

ACT Reading Test: Words to Capture Tone, List 1

Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use!

The New SAT: Words to Capture Tone

Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!