Grammar fix

seriously damaged

badly harmed

Harmed to a great extent; something is in very bad condition because of an accident, disaster, or other negative event.

collocationB1common

Hear it in context

Notice where the phrase sounds natural.

The building was seriously damaged by the fire.daily life
In my opinion, if a historical monument is seriously damaged, the government should invest in its restoration to preserve cultural heritage.IELTS speaking

Pattern: seriously damaged + noun / be seriously damaged

WrongThe car was serious damaged.

RightThe car was seriously damaged.

Adverb 'seriously', not 'serious'.

Patternseriously damaged + noun / be seriously damaged

Choose the version that sounds natural in speech.

Stiff The structure was extensively impaired by the fire.

Natural The building was seriously damaged in the fire.

Natural; 'extensively impaired' is loss-adjuster language.

Words that usually travel with it.

'Slightly damaged' means only a little harm; 'seriously damaged' means a lot of harm.