u-stem, wa-stem, adjectives

[llama_nom]

Does anyone have any thoughts on the best way to reconstruct
hypothetical Gothic cognates for English 'sallow' and 'fallow'?  Pure
u-stems: *salus (cp. skadus < *skadwaz)?  Wa-stems: *salws?  Or
u-stems from original wa-stems with -w- retained as part of the stem:
*salwus (cp. manwus)?  And is it significant that the surviving
wa-stem adjectives have long roots -- CVCC (triggws), CVCV (lasiws) --
or a monosyllabic root ending in a short vowel: CV (*faus, *qius,
*unskaus)?

LN

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