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truly
He's truly devoted to his wife.
I truly hate you.
He did his task truly but there was someone who did it better.
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frankly
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directly
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straight
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honestly
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sincerely
She said it sincerely.
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straight out
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bluntly
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plainly
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truthfully
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candidly
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earnestly
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forthrightly
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straightforwardly
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cordially
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devoutly
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in fairness to somebody
We may laugh about it, but in fairness we take it seriously.
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artlessly
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freeheartedly
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open-heartedly
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heartfully
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unfeignedly
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munificently
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guilelessly
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downrightly
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unaffectedly
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man-to-man