1. in a way that lacks good sense or judgment; foolishly
2. without purpose or meaning; pointlessly
3. in an unconscious state; without awareness

Examples

• He senselessly spent all his savings on lottery tickets.
• The building was senselessly destroyed in the riot.
• She argued senselessly with her neighbor over a trivial matter.
• The accident victim lay senselessly on the ground.
• They senselessly ignored all the warning signs.
• The violence continued senselessly for hours.
• He fell senselessly to the floor after the blow to his head.