unreliable

英[ʌnrɪ'laɪəb(ə)l] 美[,ʌnrɪ'laɪəbl]

1. liable to be erroneous or misleading;

"an undependable generalization"

2. not to be trusted

3. not worthy of reliance or trust;

"in the early 1950s computers were large and expensive and unreliable"

"an undependable assistant"

4. dangerously unstable and unpredictable;

"treacherous winding roads"

"an unreliable trestle"

5. lacking a sense of responsibility