The phrase "gives no quarter" means to show no mercy or compassion. To find antonyms for this phrase, we can look for words that describe being compassionate, merciful, or accommodating. Some antonyms for "gives no quarter" include "forgiving," "compassionate," "lenient," "tolerant," "understanding," "accommodating," and "generous." By using these words instead of "gives no quarter," we can convey a more positive and compassionate tone. For example, instead of saying "He gives no quarter to those who disagree with him," we could say, "He is very accommodating and understanding of differing viewpoints.