In “Jāʾanī rajulun karīmun, lā yamunnu bi-ʿaṭāʾih,” the added clause rules out a potentially undesirable interpretation: someone might give gifts but reproach recipients afterward. If that misunderstanding is at issue, the extra wording functions as a safeguard (iḥtirās).
By contrast, merely piling up synonyms such as “generous, giving, munificent” does not guarantee meaningful expansion. Added words should clarify, emphasize, particularize, prevent a false inference, or meet a genuine audience need.