The difference between Insincere and Untrustworthy
When used as adjectives, insincere means not genuinely meaning what has been expressed, whereas untrustworthy means not deserving of trust.
check bellow for the other definitions of Insincere and Untrustworthy
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Insincere as an adjective:
Not genuinely meaning what has been expressed; not sincere; artificial.
Examples:
"Janice's furious glare showed that her apology was insincere."
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Insincere as an adjective:
Not serious.
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Untrustworthy as an adjective:
Not deserving of trust; unreliable.