1. in a way that shows no mercy or restraint; harshly or severely
2. generously and without limitation; abundantly

Examples

• The critic reviewed the play unsparingly, pointing out every flaw.
• She worked unsparingly to meet the deadline.
• The coach criticized the team’s performance unsparingly.
• He gave unsparingly of his time to help others.
• The sun beat down unsparingly on the desert travelers.
• She donated unsparingly to the charity.
• The judge sentenced the criminal unsparingly.