suspicion
n. C / Un. a feeling that something is true or that someone has done something wrong, even if you do not have proof yet. You might have a suspicion that a friend is hiding a secret from you.
n. a belief or feeling that something is possible or likely, particularly regarding a person's guilt or a negative outcome. Often implies a lack of concrete evidence or proof.
I have a strong suspicion that she is lying.
The police officer's suspicion grew when the witness began to change the details of his story.
Despite the lack of forensic evidence, the detective acted on a lingering suspicion that the suspect had returned to the scene of the crime to retrieve the missing documents.
From Middle English suspecioun, borrowed from Latin suspīciō, suspīciōnem, from suspicere, from sub- (“up to”) with specere (“to look at”). Perhaps partly through the influence of Old French sospeçon (or rather the Anglo-Norman form suspecioun). Equivalent to suspect + -ion.
I have a suspicion about he is guiltyI have a suspicion that he is guiltyWhen expressing a specific thought or belief, use a 'that' clause rather than a prepositional phrase.