Indicates someone is not strict, maybe more forgiving than others might be in enforcing rules. The teacher was indulgent, allowing extra time for the project.
Pro Tip 2/3
Parental Caution
Often used to describe parents who don't enforce many limits on their children. Her indulgent father let her have the party she wanted.
Pro Tip 3/3
Subtle Disapproval
Sometimes implies the person is too lenient and should be firmer. His indulgent nature might spoil the kids.