As a Noun: 1. The feeling that you do not trust someone or that something is wrong in some way; a feeling that something is probably true (especially if it involves the guilt of someone) or is likely to happen. English = suspicion. As a Verb or Adjective: 1. To lack trust in someone or to think that something is wrong in some way; to feel that something is probably true (especially someone's guilt) or is likely to happen. English = suspect, (be) suspicious of.