weakness

UK: ˈwiːknəs | US: ˈwiːknəs

Definition
  1. n. the state or condition of lacking strength, power, or vigor

  2. n. a flaw or deficient point in character, reasoning, or structure

  3. n. a personal inclination or vulnerability

Structure
weak <lacking strength>ness <noun suffix indicating state or quality>
Etymology

The word "weakness" originates from Old English wācnes, derived from wāc (weak) + -nes (a suffix forming abstract nouns). The root wāc traces back to Proto-Germanic waikwaz, meaning "pliable" or "yielding," reflecting a gradual shift from physical flexibility to a lack of strength. The suffix -ness (from Proto-Germanic -nassu) solidifies the abstract concept of the condition. Over time, "weakness" expanded from physical frailty to encompass moral or structural deficiencies.

Examples
  1. His illness caused a prolonged weakness in his legs.

  2. The bridge collapsed due to a structural weakness.

  3. She admitted her weakness for chocolate.

  4. The team’s weakness in defense cost them the game.

  5. Kindness is not a weakness but a strength.