The word "un-sparing" refers to being excessively or unnecessarily harsh or critical towards someone or something. Antonyms for this word include "lenient," "tolerant," "indulgent," "forgiving," "generous," and "merciful." These terms all convey a sense of kindness, compassion, and understanding towards the person or thing in question, taking into account their weaknesses and faults. Instead of being harsh or severe, the opposite of "un-sparing" involves being patient, forgiving, and compassionate towards others, allowing room for growth and improvement without constant criticism or judgement. Practicing these antonyms can help build stronger and more positive relationships with others, promoting understanding and empathy for all.