severely

Hard is a synonym of severely.

As a noun hard

is stove, heater; an enclosed space in which fuel (usually wood) is burned to provide heating, usually for cooking.

As an adverb severely is

in a severe manner.

Severely is a related term of intensely.

As adverbs the difference between severely and intensely

is that severely is in a severe manner while intensely is in an intense manner.

As adverbs the difference between sternly and severely

is that sternly is in a stern manner while severely is in a severe manner.

Forcibly is a related term of severely.

As adverbs the difference between forcibly and severely

is that forcibly is in a forcible manner while severely is in a severe manner.

As adverbs the difference between forcefully and severely

is that forcefully is in a forceful manner; vigorously; powerfully while severely is in a severe manner.

As adverbs the difference between extremely and severely

is that extremely is to an extreme degree while severely is in a severe manner.

Severely is a related term of violently.

As adverbs the difference between severely and violently

is that severely is in a severe manner while violently is in a violent manner.

As adverbs the difference between powerfully and severely

is that powerfully is in a powerful manner while severely is in a severe manner.

As adverbs the difference between heavily and severely

is that heavily is in a heavy manner while severely is in a severe manner.

As adverbs the difference between severely and sorely

is that severely is in a severe manner while sorely is in a sore or desperate manner.