From ܕܲܥܬܝܼܕ (daˁtīd, “the future”) + -ܝܐ (-āyā, the attributive adjective ending); compare Hebrew עֲתִידִי (atidí).
ܥܬܝܼܕܵܝܵܐ • (ˁtīdāyā) (feminine ܥܬܝܼܕܵܝܬܵܐ (ˁtīdāytā), plural ܥܬܝܼܕܵܝܹ̈ܐ (ˁtīdāyē))