unrelenting
/ˌʌnrɪˈlentɪŋ/adjective
1- not yielding in strength, severity, or determination不放松的; 不屈不挠的; 不缓和的：
the heat was unrelenting.
热浪不见缓和。
1.1
- (of a person or their behaviour) not giving way to kindness or compassion（人, 行为）冷酷无情的; 铁石心肠的：
unrelenting opponents.
冷酷的对手。
派生词