Adjective
ill-spent (not comparable)
Of money, not spent wisely.
Remember that every guilty compliance with the humors of the world, every sinful indulgence of our own passions, is laying up cares and fears for the hour of darkness; and that the remembrance of ill-spent time will strew our sick-bed with thorns, and rack our sinking spirits with despair. Reginald Heber
It was remarked to me...that to play billiards well was a sign of an ill-spent youth. Herbert Spencer