"unreliable" in the adjective sense
1. undependable, unreliable
liable to be erroneous or misleading
"an undependable generalization"
2. unreliable, undependable
not worthy of reliance or trust
"in the early 1950s computers were large and expensive and unreliable"
"an undependable assistant"
3. treacherous, unreliable
dangerously unstable and unpredictable
"treacherous winding roads"
"an unreliable trestle"
4. unreliable
lacking a sense of responsibility
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License