Concept:Synonyms are words that share a similar meaning. The word "Feeble" means lacking physical strength or energy.Explanation:"Feeble" describes a person or thing that is weak, especially due to age or illness."Weak" directly means having little strength or energy, matching the meaning of "Feeble".Thus, "Weak" is the correct synonym.The other options—Robust, Strong, Sturdy—all mean powerful or resilient, which are opposite in meaning.Answer:D. Weak