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adj, -tier or -tiest
1. not trusty or trustworthy; undependable
2. archaic unfaithful; faithless
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|Adj.||1.||untrusty - not worthy of trust or belief; "an untrustworthy person"|
undependable, unreliable - not worthy of reliance or trust; "in the early 1950s computers were large and expensive and unreliable"; "an undependable assistant"
unfaithful - not true to duty or obligation or promises; "an unfaithful lover"