Big Lummox is a term used to describe someone who is clumsy, foolish, or slow-witted. The crossword solutions for this term are APE (3 letters) and GALOOT (6 letters). APE is an animal that is known for its lack of intelligence and is often used as a metaphor for someone who is not very smart. GALOOT is a slang term for a clumsy or stupid person. Both terms are used to describe someone who is not very intelligent or competent.