devocalize or devocalise /dē-vōˈkə-līz/ or devoice /dē-voisˈ/

To make voiceless

• underdoing
• underdone
• underdrain
• underdrained
• underdraining
• underdrains
• underdraw
• underdrawing
• underdrawings
• underdrawn
• underdraws
• underdress
• underdressed
• underdresses
• underdressing
• underdrew
• underdrive
• under-driven
• underdrives
• underearth
• undereducated
• underemphasise
• underemphasised
• underemphasises
• underemphasising