IPA: /sɪˈvɪrli/
KK: /səˈvɪrli/
In a way that is very serious or harsh.
The storm severely damaged the old building.
Severely → It is formed from "severe" (from Latin *severus*, meaning serious or strict) and the adverbial suffix "-ly" (meaning in a manner of). The word "severely" means in a serious or strict manner.
Think of something being done in a 'serious' way ('severe') — the '-ly' just means it's done in that manner. This helps you remember that 'severely' means to do something in a serious or strict way.