Thesaurus

stiffen

verb

Definition of STIFFEN

to make more harsh, uncompromising, or severe <plans to further stiffen the already onerous requirements for admission to the elite military unit>
Near Antonyms lessen, moderate, soften
Antonyms ameliorate, ease

April 01, 2015
diapause Hear it
a period of physiological dormancy
Take a 3-minute break and test your skills!
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears