Contrastive analysis (CA) is a sub-discipline of linguistics dealt with comparison of two or more languages; it permits to detect the similarities and differences between them. This study aimed at contrasting the order of attributive adjectives in English, an Indo-European language and Sereer Siin, a Negro African language spoken in Senegal in the area of Fatick. The study involved 25 male students who were Sereer speakers and learners of English as a second language at the English department of Cheikh Anta Diop University. A test of 112 items in both languages was given to them. It was composed of 56 in English and 56 in Sereer. These students were asked to order correctly in a sentence two attributive adjectives in each language. However, the results revealed that in both languages there were more differences than similarities. However, the identical features of both languages are the fact that : adjectives of size precede adjectives of shape and of age, adjectives of color are placed before adjectives of Origin/nationality and of purpose; and adjectives of material are positioned before adjectives of purpose. There is an exception with ŋas which is the only adjective of age that should be placed after adjectives of size. Thus, this paper will enable to promote and develop the Sereer language and culture around the world. It will definitely be an invaluable resource for English speakers who are interested in the functioning of the order of attributive adjectives in Sereer Siin.