abate+severity+or+rigor
1relent — v. n. Soften (in temper), grow lenient or tender, abate severity or rigor, yield, relax, comply, feel compassion …
2cool — Synonyms and related words: Buddha like composure, Laodicean, OK, Olympian, Oriental calm, abate, abnegation, above all that, absolute zero, abstinence, ace high, affectless, aguey, aguish, air condition, air cool, algid, algidity, allay, aloof,… …