IPA: /sɪˈvɪər.nəs/
KK: /sɪˈvɪr.nəs/
The quality or state of being very serious, strict, or harsh.
The severeness of the storm caused many people to stay indoors.
Severeness is formed from "severe" (from Latin "severus", meaning serious or strict) and the suffix "-ness" (meaning the state or quality of). The word "severeness" refers to the quality of being serious or strict.
Think of the word 'severe' which means serious, and remember that 'severeness' describes the state of being serious.