adjective
a word that describes or modifies a noun or pronoun, in this case, 'honest' describes someone who is truthful and sincere
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To be honest, I must say that the company's financial situation is not looking good.
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Honestly, I don't think he will show up to the party tonight.
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I swear, I'm being honest when I say the new restaurant is lit.
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She wore her heart on her sleeve, always honest about her feelings.