suspectsuspectsuspectssuspectedsuspecting1verb (suspects, suspecting, suspected)1to think that something is true, but not be certain: John wasn't at college today – I suspect that he's ill.2to think that somebody has done something wrong but not be certain: They suspect Helen of stealing the money.The noun is suspicion and the adjective is suspicious.suspectsuspectsuspects2nouna person who you think has done something wrong: The police have arrested two suspects.