1. Silent, not saying anything
   "Organized crime is thriving online but many victims want to keep stumm"
   - shtum, schtum, shtoom

Encyclopedia: Stumm

• nondriver
• none
• nonechoic
• noneffective
• noneffervescent
• nonelastic
• nonelected
• nonelective
• nonelectric
• nonelectrical
• nonenterprising
• nonentity
• nonenzymatic
• nonequivalence
• nonequivalent
• nones
• nonessential
• nonesuch
• nonesuch clover
• nonet
• nonetheless
• nonevent
• nonexempt
• nonexistence
• nonexistent