An archaic or dialect adverb meaning in a burdensome or troublesome manner.
From 'cum' (from Latin cum, with, together) or from 'cume' (to encumber), plus the -ly adverbial suffix. Primarily found in Middle English texts.
The shortening from 'cumberingly' to 'cumly' shows how English speakers historically preferred compression—modern English would never create such condensed forms, reflecting how we've become more explicit.
Complete word intelligence in one call. Free tier — 50 lookups/day.