sincere

Being sincere is being genuine. If someone compliments you on your outfit, but you notice them rolling their eyes when they think you’re not looking, they probably weren't being sincere.

If you've been offered a sincere thanks for something you've done, the person is probably really grateful. Sometimes when people say "thank you," they don't always mean it, but when they add the adjective sincere, the emphasis is usually for a very good reason. You may hear a charity sending out a sincere thanks to sponsors for their donations, which help keep the charity running.

Definitions of sincere
  1. adjective
    open and genuine; not deceitful
    “he was a good man, decent and sincere
    “felt sincere regret that they were leaving”
    sincere friendship”
    Synonyms:
    echt, genuine
    not fake or counterfeit
    honest, honorable
    not disposed to cheat or defraud; not deceptive or fraudulent
    artless, ingenuous
    characterized by an inability to mask your feelings; not devious
    existent, real
    being or occurring in fact or actuality; having verified existence; not illusory
    bona fide
    undertaken in good faith
    cordial
    sincerely or intensely felt
    dear, devout, earnest, heartfelt
    earnest
    honest
    without dissimulation; frank
    genuine, true, unfeigned
    not pretended; sincerely felt or expressed
    heart-whole, whole-souled, wholehearted
    with unconditional and enthusiastic devotion
    true
    consistent with fact or reality; not false
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    Antonyms:
    insincere
    lacking sincerity
    counterfeit, imitative
    not genuine; imitating something superior
    dishonest, dishonorable
    deceptive or fraudulent; disposed to cheat or defraud or deceive
    artful, disingenuous
    not straightforward or candid; giving a false appearance of frankness
    unreal
    lacking in reality or substance or genuineness; not corresponding to acknowledged facts or criteria
    bootlicking, fawning, obsequious, sycophantic, toadyish
    attempting to win favor from influential people by flattery
    buttery, fulsome, oily, oleaginous, smarmy, soapy, unctuous
    unpleasantly and excessively suave or ingratiating in manner or speech
    dissimulative
    concealing under a false appearance with the intent to deceive
    false
    deliberately deceptive
    feigned
    not genuine
    gilded, meretricious, specious
    based on pretense; deceptively pleasing
    hypocritical
    professing feelings or virtues one does not have
    plausible
    given to or characterized by presenting specious arguments
    false
    not in accordance with the fact or reality or actuality
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  2. adjective
    characterized by a firm and humorless belief in the validity of your opinions
    “an entirely sincere and cruel tyrant”
    synonyms: earnest, solemn
    serious
    concerned with work or important matters rather than play or trivialities
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