spitless

From spit +‎ -less.

spitless (not comparable)

1. Having a dry mouth; greatly frightened; see usage notes below.

• This term is primarily found in the verb phrase scare spitless (“to frighten (a person) to the point that his or her mouth goes dry”) and its participial adjective scared spitless (“frightened to the point that one's mouth has gone dry”). It may be considered a euphemism for shitless, or as a more evocative variant of certain uses of witless and speechless.

• shitless
• witless