VERBS

be, feel, look, seem
remain, stay
Exercise is important if you want your muscles to stay firm
make sth
Use extra stuffing to make the cushions firmer
keep sth
exercises to keep your muscles firm

ADV

very
fairly, quite, reasonably

VERBS

be, sound
hold, remain, stand
Jo held firm: nothing else would do. We stand firm on these principles

ADV

very
fairly, quite

PREP

with
I have always been quite firm with my children