1. Open to doubt or suspicion
   - doubtful, dubious, dubitable, doubtable

See also: questionable

• background
• background knowledge
• background level
• background music
• background noise
• background processing
• background radiation
• background signal
• backgrounder
• backgrounding
• backhand
• backhand drive
• backhand shot
• broken-backed
• broken-down
• broken-field
• brokenhearted
• brokenheartedly
• brokenheartedness
• brokenly
• brokenness
• broker
• broker-dealer
• brokerage
• brokerage account