unreliable

From Wiktionary

Word parts[change]

un- + reliable

Pronunciation[change]

Adjective[change]

Positive
unreliable

Comparative
more unreliable

Superlative
most unreliable

  1. When something or someone is unreliable, it cannot be trusted.
    He is an unreliable source of this murder case as he is a good friend of the suspect and would then try to defend him.