un ‧ re ‧ li ‧ a ‧ ble AC /ˌʌnrɪˈlaɪəb ə l◂/ BrE AmE adjective
[ Word Family: noun : ↑ reliability , ↑ reliance ; adjective : ↑ reliable ≠ ↑ unreliable , ↑ reliant ; verb : ↑ rely ; adverb : ↑ reliably ]
unable to be trusted or depended on:
The car’s becoming very unreliable.
an unreliable witness