KEY: Questionable.
SYN: Doubtful, dubious, problematical, disputable, debatable,uncertain, suspicious.
ANT: Certain, evident, self-evident, obvious, indisputable.

• Obtuse
• Obumbrate
• Obverse, [See {[_]?}]
• Obvious
• Occasionally
• Occasion
• Occasion \v
• Occult
• Occupancy
• Occupant
• Occupation
• Occupier, [See OCCUPANT]
• Occupy
• Occur
• Occurrence
• Ocular
• Odd
• Odious
• Odor
• Odorous, [See FRAGRANT]
• Offal, [See CREAM]
• Offence, Offense
• Offend
• Offender, [See CULPRIT]
• Offensive