clement, easy, permissive, indulgent, soft, undemanding, lax, relaxed, soft-handed, superlenient, more...

strict, severe, harsh

forgiving, merciful, indulgent, tolerant, permissive, understanding, compassionate, kind, gentle, more...

more, little, whole, boolean, extra, real, strict, astonishingly, spiritual, mighty

not strict,   less stringent,   less strict,   not harsh,   far from stringent,   not very strict,   not demanding,   stern's opposite,   not at all strict,   too forgiving