Doubtful (6)
'doubtful' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for suspect that I've seen before include "Questionable" , "Possible criminal - doubtful" , "Imagine guilt" , "One thought guilty of a crime" , "Believe (someone) guilty" .)
'doubtful' is the definition.
(I know that doubtful can be written as dubious)
This is the entire clue.
(Other definitions for dubious that I've seen before include "Arousing suspicion" , "Sceptical, doubtful" , "Open to suspicion" , "Ambiguous or suspect" , "Of questionable value" .)
'doubtful' is the definition.
(both can mean dubious)
This is all the clue.
(Other definitions for iffy that I've seen before include "Not certain, doubtful" , "Doubtful (colloq.)" , "Dubious, risky (inf.)" , "Dodgy" , "not kosher" .)
'doubtful' is the definition.
(similar in meaning)
This is the entire clue.
(Other definitions for questionable that I've seen before include "Iffy" , "Uncertain" , "Dubious" , "Suspect, unproven" , "Doubtful - possibly dishonest" .)
'doubtful' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for uncertain that I've seen before include "dubious" , "Not convinced" , "Not definitely known" , "Lacking confidence" , "Changeable" .)
(Other definitions for sceptical that I've seen before include "Disinclined to believe" , "Doubtful" , "Inclined not to believe" , "Doubting or disbelieving" , "dubious" .)
'doubtful' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for unsure that I've seen before include "Not certain, doubtful" , "Not certain, dubious" , "Lacking confidence" , "Far from certain" , "Diffident, uncertain" .)