A root Tolkien introduced to explain S. pinnath “ridges” (class plural of pind) in Pinnath Gelin “Green Ridges” (PE17/173). It appeared below √PED “fall in steep slant, incline, slope”, which was the basis for the similarly formed S. pend “slope”. In notes elsewhere Tolkien said that pinnath was a blending of the two plural forms of pend: general plural pind and class plural pennath (PE17/24), but it seem he later decided pind was from the distinct root √KWIN.
Primitive elvish
kwi
root. suppose
kwin
root. crest, salient or top edge
kwis
root. inquire, suppose
kwinde
noun. crest, ridge
kwik(w)
root. languid
kwil
root. colour, colour, color
kwilid
root. quiet
kwilit
root. belt, girdle
kwin
root. *squeak
kwir
root. stir, spin
kwit
root. knit
A root Tolkien introduced in the late 1960s with the gloss “suppose”, appearing beside √KE “maybe” (PE22/158). It also had an extended (verbal) form √KWIS “inquire, suppose” in this same document. This late root may have been a restoration of much earlier ᴱ√IQI “request, ask for” from the Qenya Lexicon of the 1910s, whose derivatives had to do with requests and requirements (QL/43).
The roots √KWI and √KE were in competition in the late 1960s as the basis for “if” words in hypthotheticals; see the entry on √KE/EKE for these alternatives.
Neo-Eldarin: For purposes of Neo-Eldarin I think it is best to use √KWI for “if” and √KE for “maybe”; I also think √KWI(S) “inquire” can be used to justify the restoration of some of the derivatives of early ᴱ√IQI, via a hypothetical Neo-Eldarin root ᴺ√IKWI(S) “request, ask for”.