Enfeeble (verb)

1. To make weak or feeble.
2. To impair the strength or vitality of.
3. To reduce the effectiveness or power of.

Origin:

From middle english enfeblen, from old french enfeblir, from en- + feble weak, from latin debilis, from debilis weak, from de- + habilis able.

Examples:

1. The illness had enfeebled him so much that he could barely stand.
2. The long hours of work enfeebled her and she struggled to keep her eyes open.
3. The constant criticism enfeebled his confidence.
4. The budget cuts enfeebled the department's ability to function properly.
5. The heat enfeebled the players and they struggled to perform.