In a way that forces or requires someone to do something without choice or refusal.
From 'compulsory' (required by law or rule) + adverbial suffix '-ly'. 'Compulsory' itself comes from Late Latin 'compulsorius' derived from 'compellere' (to drive together).
The shift from 'compulsorily' (by external force) to describing internal psychological compulsions shows how language tracks human understanding—we've learned that our brains can impose their own invisible rules, just like any law can.
Complete word intelligence in one call. Free tier — 50 lookups/day.