permitting, letting, favoring, allowing, sympathetic, loving, kind, forgiving
Some synonyms for compassion would be: humane, lenient, merciful, pitiful and tender.
The opposite could be strict (not lenient), or harsh (the reverse of lenient).
The antonym of lenient is strict.
The judge's decision was lenient, she was only given a fine.
Lenient? 150 years is a life sentence. Only a death penalty could be less lenient.
Lenient: adj.: To go easy on someone or something. To be patient, kind and gentle.
How about convenient
stern
A lenient sentence gives some leeway to the defendant and is less harsh than wanted or expected.
lenient
lenient
strict