Pronunciation: (wēk'nis),[key] —n. 1. the state or quality of being weak; lack of strength, firmness, vigor, or the like; feebleness.
2. an inadequate or defective quality, as in a person's character; slight fault or defect: to show great sympathy for human weaknesses. 3. a self-indulgent liking or special fondness, as for a particular thing: I've always had a weakness for the opera. 4. an object of special desire; something very difficult to resist: Chocolates were her weakness.