fierce

fierce /ˈfirs/ adjective
fiercer; fiercest
fierce
/ˈfirs/
adjective
fiercer; fiercest
Britannica Dictionary definition of FIERCE
1 
a  : very violent
b  : eager to fight or kill
2 
: having or showing a lot of strong emotion : very strong or intense
3 
: very harsh or powerful

something fierce

US, informal
: very badly or very much

— fiercely

adverb [more fiercely; most fiercely]

— fierceness

noun [noncount]