1. Gesture without words: pantomime.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• sumb show,
• xumb show,
• cumb show,
• fumb show,
• rumb show,
• eumb show,
• dymb show,
• dhmb show,
• djmb show,
• dimb show,
• d8mb show,
• d7mb show,
• dunb show,
• dukb show,
• dujb show,
• dumv show,
• dumn show,
• dumh show,
• dumg show,
• dumb ahow

The adjective form of "dumb show" is "dumbshow" or "dumb-show".

The plural form of "dumb show" is "dumb shows".

The singular form of the word "dumb show" is "dumb show". The word does not change when referring to a single instance of a dumb show.