كَثِيرُ الرَّمَادِ
A person with plentiful ash; implying hospitality.
Merely answering “generous” omits the reasoning. Show the chain: abundant ashes imply frequent fires, repeated cooking, frequent entertaining of guests, and thereby hospitality. This is an indirect route to the intended quality.
The exercise revision “he is generous” improves immediate accessibility but loses the cultural and visual implication. If the audience lacks the relevant cultural background, plain wording may nevertheless serve explanation better.