1) trusted and loyal companion (comrade)

2) a person who is trusted with personal secrets (confidant)

3) a wise and trusted adviser and helper (mentor)

4) that may be trusted or depended on (reliable)

5) not to be trusted (shifty)

6) (used to express difficulty in believing) if experience or probability can be trusted (surely)

7) having, showing, causing, a feeling of doubt (because a person, thing, cannot be trusted or believed) (suspicious)

8) that cannot be relied on; not to be trusted (unreliable)