1. Open to doubt or suspicion
   - doubtful, dubious, dubitable, in question 
2. [archaic] Inspiring fear
   - formidable, redoubtable, unnerving

See also: alarming, questionable

• screen pass
• screen saver
• screen test
• screener
• screening
• screenland
• screenplay
• screenshot
• screenwriter
• screw
• screw auger
• screw augur
• screw eye
• screw jack
• screw key
• screw log
• kinetic theory of gases
• kinetic theory of heat
• kinetics
• kinetochore
• Kinetoscope
• kinetosis
• kinfolk
• king
• King Arthur