Where does “cumbrously” come from?

cumbrously (English) comes from English cumbrous, from Middle English combrous, from Middle English -ous, from Old French -us, from Latin -ōsus, from Old Latin -ōssus.

cumbrously (English): In a cumbrous manner

Definitions

In a cumbrous manner

Ancestry of “cumbrously”, step by step

cumbrously traces back through two separate lines of ancestry.

via English cumbrous

Step	Language	Word	Meaning
1	English	cumbrous	Unwieldy because of its weight; cumbersome;...
2	Middle English	combrous	—
3	Middle English	-ous	—
4	Old French	-us	-ous, used for forming adjectives
5	Latin	-ōsus	ose, -ous, -ful (full of or overly prone to)
6	Old Latin	-ōssus	—

via English ly

Step	Language	Word	Meaning
1	English	ly	Abbreviation of light-year
2	Vietnamese	ly	Alternative spelling of li

Every word from Old Latin -ōssus →Every word from Latin -ōsus →Every word from Old French -us →