Related Clues:

• Doubtful, not definite
• Wary or prudent
• Not certain, doubtful
• Reluctant, feeling indecision
• Chancy, suspect
• Prudent, slow to take a chance
• Informally dubious, not definite
• Watchful, prudent
• Of doubtful quality or legality
• 'Watchful, prudent (8)'
• Lacking decisiveness
• Irresolute, vacillating
• The IOU, as cut, will never give you a rash.
• It's by no means certain that he has it with the insect
• One might pound what's so questionable to make it go through Dublin, by the sound of it