The Etymologies of the 1930s had N. rhaen “crooked” derived from from primitive ᴹ✶ragnā under the root ᴹ√RAG (Ety/RAG).
Neo-Sindarin: Many Neo-Sindarin writers adapt this adjective as ᴺS. raen as suggested in HSD (HSD), since the unvoicing of initial r to rh was a feature of Noldorin of the 1930s but not Sindarin of the 1950s and 60s. However, in this case the nearest equivalent root in Tolkien’s later writing is √SRAG “awkward, hard, difficult” (PE17/154, 158, 172, 185). Using this root I would keep the form ᴺS. rhaen “crooked” without modification, since primitive sr- produces rh- in Sindarin. This eliminates conflicts with several later Sindarin words of the form raen.
Conceptual Development: The Gnomish Lexicon of the 1910s had G. gwegla “crooked” based on the early root ᴱ√gwedh- (GL/46), and it also had G. craig “crooked” (GL/46), probably based on the early root ᴱ√KṚKṚ (QL/48). The word craig “crooked” also appeared in Gnomish Lexicon Slips modifying that document (PE13/111). The Early Noldorin Grammar of the 1920s instead had ᴱN. gwag or gog “crooked” (PE13/122), and Early Noldorin word-lists from this same period had {gog >>} gaug “crooked” (PE13/144).
The Etymologies of the 1930s had N. rhaen “crooked” derived from from primitive ᴹ✶ragnā under the root ᴹ√RAG (Ety/RAG).
Neo-Sindarin: Many Neo-Sindarin writers adapt this adjective as ᴺS. raen as suggested in HSD (HSD), since the unvoicing of initial r to rh was a feature of Noldorin of the 1930s but not Sindarin of the 1950s and 60s. However, in this case the nearest equivalent root in Tolkien’s later writing is √SRAG “awkward, hard, difficult” (PE17/154, 158, 172, 185). Using this root I would keep the form ᴺS. rhaen “crooked” without modification, since primitive sr- produces rh- in Sindarin. This eliminates conflicts with several later Sindarin words of the form raen.
Conceptual Development: The Gnomish Lexicon of the 1910s had G. gwegla “crooked” based on the early root ᴱ√gwedh- (GL/46), and it also had G. craig “crooked” (GL/46), probably based on the early root ᴱ√KṚKṚ (QL/48). The word craig “crooked” also appeared in Gnomish Lexicon Slips modifying that document (PE13/111). The Early Noldorin Grammar of the 1920s instead had ᴱN. gwag or gog “crooked” (PE13/122), and Early Noldorin word-lists from this same period had {gog >>} gaug “crooked” (PE13/144).