The difference between Sincere and Untrustworthy
When used as adjectives, sincere means genuine, whereas untrustworthy means not deserving of trust.
check bellow for the other definitions of Sincere and Untrustworthy
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Sincere as an adjective:
Genuine; meaning what one says or does; heartfelt.
Examples:
"I believe he is sincere in his offer to help."
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Sincere as an adjective:
Meant truly or earnestly.
Examples:
"She gave it a sincere, if misguided effort."
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Sincere as an adjective (archaic):
clean; pure
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Untrustworthy as an adjective:
Not deserving of trust; unreliable.