Where does “blunderously” come from?

blunderously (English) comes from English blunderous, from English -ous, from Middle English -ous, from Old French -us, from Latin -ōsus, from Old Latin -ōssus.

blunderously (English): in a blunderous manner

Definitions

in a blunderous manner

Ancestry of “blunderously”, step by step

blunderously traces back through two separate lines of ancestry.

via English blunderous

Step	Language	Word	Meaning
1	English	blunderous	Prone to make blunders
2	English	-ous	Used to form adjectives from nouns, to denote...
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 →