häftig betyder på engelska

cool [cooler, coolest]▼(colloquial: being considered as "popular" by others)
adjective
[UK: kuːl] [US: ˈkuːl]I've seen a lot of cool things. = Jag har sett en massa häftiga saker.

hot [hotter, hottest]▼(popular, in demand)
adjective
[UK: hɒt] [US: hɑːt]

vehement▼(showing strong feelings; passionate; forceful or intense)
adjective
[UK: ˈviːə.mənt] [US: ˈviːə.mənt]