suspect
vb
1 distrust, doubt, harbour suspicions about, have one's doubts about, mistrust, smell a rat (informal)
2 believe, conclude, conjecture, consider, fancy, feel, guess, have a sneaking suspicion, hazard a guess, speculate, suppose, surmise, think probable
adj
3 dodgy (Brit., Austral., & N.Z. informal) doubtful, dubious, fishy (informal) iffy (informal) open to suspicion, questionable
Antonyms
, vb accept, be certain, be confident of, believe, buy (slang) have faith in, know, swallow (informal) think innocent, trust
adj above suspicion, innocent, reliable, straightforward, trustworthy, trusty