1. 严厉：severely /严厉地/严重地/ | severeness /严厉/ | severity /严格/严重/激烈/严酷/简朴/雅致/严厉/

noun

1. excessive sternness

e.g. severity of character
the harshness of his punishment was inhuman
the rigors of boot camp

Synonym: severityharshnessrigorrigourrigorousnessrigourousnessinclemencyhardnessstiffness

2. extreme plainness

Synonym: austerenessseverity

3. something hard to endure

e.g. the asperity of northern winters

Synonym: asperitygrimnesshardshiprigorrigourseverityrigorousnessrigourousness

4. used of the degree of something undesirable e.g. pain or weather

Synonym: badnessseverity