A Hadith is ḥasan li-dhātihi (حسن لذاتہ) when a narrator has relatively lower precision and the other four conditions of ṣaḥīḥ li-dhātihi are present.
Khafīf al-ḍabṭ (خفیف الضبط) means less strong memory compared with a fully precise narrator. It does not mean being unable to preserve Hadith at all.
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Ḥasan li-Dhātihi: Definition and Ruling
A Hadith is ḥasan li-dhātihi (حسن لذاتہ) when a narrator has relatively lower precision and the other four conditions of ṣaḥīḥ li-dhātihi are present.
Khafīf al-ḍabṭ (خفیف الضبط) means less strong memory compared with a fully precise narrator. It does not mean being unable to preserve Hadith at all.