speakable

adjective3

1. •
   That can be spoken; utterable, verbalizable.
2. •
   Acceptable as a topic of discussion; not subject to taboo.

   • Once the group knows that suicide is a speakable topic […] — 2004
3. •
   (no longer used) Capable of speech.

   • Redouble then this miracle, and say, / How cam'st thou speakable of mute […] — 1667