ADV
- extremely, very
- strictly
- Learning was by rote and strictly formal
- almost
- The greeting was polite, almost formal
- fairly, quite, rather, relatively
- oddly
- Her words sounded oddly formal
- stiffly
- His manner was stiffly formal
ADV
- merely, purely
- Getting approval for the plan is a purely formal matter: nobody will seriously oppose it
- largely
- The monarch retains largely formal duties