ᴱ√PAPA root. “*tremble”
An unglossed root in the Qenya Lexicon of the 1910s with derivatives like ᴱQ. pampile “trembling” and ᴱQ. papa- “tremble” (QL/72). The verb G. paptha- “tremble, quiver” from the contemporaneous Gnomish Lexicon is clearly related (GL/63). There are no signs of this root in Tolkien’s later writing, but I think it is worth retaining for purposes of Neo-Eldarin.
Reference ✧ QL/72