weak kneed

/ˈwikˌnid/
adjective
  1. Lacking courage, determination, or strength of character; easily intimidated or persuaded.
    • She called her opponent weak-kneed for backing down from the debate.
    • The manager was too weak-kneed to stand up to the board's unfair demands.
    • A weak-kneed leader cannot inspire confidence in a crisis.
  2. Physically weak in the knees; feeling unable to stand or walk steadily, often from fear, illness, or exhaustion.
    • The sight of the enormous wave made her weak-kneed with fear.
    • After the long hike, he felt weak-kneed and had to sit down.
    • He was weak-kneed from the flu and could barely make it to the bathroom.
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