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

See also: questionable

• semiterrestrial
• Semitic
• Semitic deity
• Semitic-speaking
• Semitism
• semitone
• semitrailer
• semitrance
• semitransparency
• semitransparent
• semitropic
• semitropical
• semitropics
• semivowel
• semiweekly
• Semnopithecus entellus
• semolina
• Sempatch
• sempervivum
• sempiternal
• sempiternity
• sempre
• sempstress
• Semtex
• sen