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.

Ana Milagros, 64, who was waving a Vatican flag, said she thought the US-born pope seemed "approachable" and "very sincere".

From Barron's • Jun. 7, 2026

“The words I get from people are so sincere and so heartfelt, they’re not just fanboying or fangirling,” Brantley adds.

From Los Angeles Times • May 27, 2026

Even so, “The Late Show with Stephen Colbert” was and is sincere and wholesome, even moving at times.

From Salon • May 21, 2026

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

From The Wall Street Journal • May 15, 2026

I don’t think Maxim could have borne it, with Beatrice sitting here, staying in the house, sincere, anxious, and affectionate, but asking questions all the time.

From "Rebecca" by Daphne du Maurier

Vocabulary lists containing sincere

The SAT: Words to Capture Tone, List 2

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ACT Reading Test: Words to Capture Tone, List 1

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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!