weak

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Related to have a weakness for: Strength and Weakness

weak

(wēk) [Old Norse veikr, flexible]
1. Lacking physical strength or vigor; infirm, esp. as compared with what would be the normal or usual for that individual.
2. Dilute, as in a weak solution, or weak tea.
3. Biologically or chemically active; said, e.g., of acids, bases, electrolytes, muscles, or toxins.