unreliable

Từ điển Oxford Advanced Learner 8th

un·re·li·able AW [unreliability unreliable] BrE [ˌʌnrɪˈlaɪəbl] NAmE [ˌʌnrɪˈlaɪəbl] adjective
that cannot be trusted or depended on
•The trains are notoriously unreliable.
•He's totally unreliable as a source of information.
Opp: ↑reliable
Derived Word: ↑unreliability

• Từ đồng nghĩa / Synonyms:
  treacherous, undependable
• Từ trái nghĩa / Antonyms:
  reliable, dependable