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1. 难凭：难平息的inappeasable | 难凭undependable | 难取悦的fastidiousfussy
adj
1. not worthy of reliance or trust
e.g. in the early 1950s computers were large and expensive and unreliable
an undependable assistant
Synonym: unreliable
2. liable to be erroneous or misleading
e.g. an undependable generalization
Synonym: unreliable