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

To make voiceless

• unspectacular
• unspeculative
• unsped
• unspell
• unspelled
• unspelling
• unspells
• unspent
• unsphere
• unsphered
• unspheres
• unsphering
• unspi'd
• unspide
• unspied
• unspilled
• unspilt
• unspirited
• unspiritual
• unspiritualise
• unspiritualised
• unspiritualises
• unspiritualising
• unspiritualize
• unspiritualized