In a bigoted manner; with stubborn refusal to consider different opinions or respect for beliefs different from one's own.
From 'bigoted' (adjective, from 'bigot' which came from Middle French 'bigot,' possibly from Old Norse 'by Gott' meaning 'by God') plus the adverbial suffix '-ly'.
The origin 'by Gott' is disputed but delightful—it suggests the word originated as a scornful phrase about overly pious people, and centuries later we still use it to criticize closed-minded thinking.
Complete word intelligence in one call. Free tier — 50 lookups/day.