1. Lessen the strength of
   "The fever weakened his body" 
2. Become weaker
   "The prisoner's resistance weakened after seven days" 
3. Destroy property or hinder normal operations
   - sabotage, undermine, countermine, counteract, subvert 
4. Reduce the level or intensity or size or scope of
   - de-escalate, step down 
5. Lessen in force or effect
   - dampen, damp, soften, break

Derived forms: weakening, weakens, weakened

See also: weakener, weakening

Type of: alter, blunt, change, deaden, decrease, diminish, disobey, fall, lessen, minify, modify

Antonym: strengthen

• invitatory
• invite
• invite out
• invitee
• inviter
• inviting
• invitingly
• invocation
• invocatory
• invoice
• invoke
• involucrate
• involucre
• involuntarily
• involuntariness
• involuntary
• involuntary muscle
• involuntary trust
• involute
• involuted
• involution
• involutional depression
• involve
• involved
• involvement