slow-witted
adjective uk/ˌsləʊˈwɪt.ɪd/ us/ˌsloʊˈwɪt̬.ɪd/
头脑迟钝的，反应迟缓的
not clever and therefore slow to notice or understand things
Synonyms: backward (NOT INTELLIGENT/MODERN)dim (NOT CLEVER) half-witted
See also: slow adjective (NOT CLEVER)