diaeresis or dieresis /dī-ērˈi-sis or -erˈ/

1. A mark ( ¨ ) placed over a vowel, esp the second of two adjacent ones to show that it is to be pronounced separately, as in naïf
2. A pause or break where the end of the word coincides with the end of a foot (prosody)

• untaintedly
• untaintedness
• untaintednesses
• untainting
• untaken
• untalented
• untalked-of
• untamable
• untamableness
• untamablenesses
• untamably
• untame
• untameable
• untameableness
• untameablenesses
• untameably
• untamed
• untamedness
• untamednesses
• untames
• untaming
• untangible
• untangle
• untangled
• untangles