|m. sg.||f. sg.||pl.|
|beautiful||شباب šbab||شابّة šabba||شابّين šabbin|
|other||آخُر axŭṛ||أُخرى ŭxṛa||أُخرين ŭxṛin|
A third case is rather different. "Such-and-such (a person), so-and-so" is expressed by the noun m. sg. فلان flan, f. sg. فلانة flana, with no known plural. (This originally Arabic form is rather widely borrowed; you may be familiar with it from Spanish fulano). From this we can derive an adjective "such-and-such a" by adding a nisba suffix -i: m. sg. فلاني flani, but f. sg. فلانتية flantiyya. To make matters worse, we suddenly find ourselves with a gender distinction in the plural, something otherwise absent from adjectival agreement in this dialect: m. pl. فلانيين flaniyyin, f. pl. فلانتيين flantiyyin.
What's going on, though anomalous, is pretty clear (recall that feminine -a regularly becomes -t in the construct state): this adjective is displaying double agreement, gender agreement alone on the nominal root flan, and normal gender+number agreement on the adjectival derivational suffix -i. Can you think of any comparable cases elsewhere?