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

See also: questionable

• sparkly
• sparkplug wrench
• sparky
• sparling
• Sparmannia
• Sparmannia africana
• sparring
• sparring match
• sparring mate
• sparring partner
• sparrow
• sparrow hawk
• Sparrow Unit
• sparrow-sized
• sparse
• sparsely
• sparseness
• sparsity
• Sparta
• Spartacus
• spartan
• sparteine
• Spartina
• Spartina cynosuroides
• Spartina pectinmata