衰弱

shuāiruò
  1. weak
  2. feeble

CEDICT

Entry Composition

1 衰 shuāi (bound form) to decay; to decline; to wane
2 弱 ruò
  1. weak; feeble
  2. young
  3. inferior; not as good as
  4. (following a decimal or fraction) slightly less than