Impractical (adjective) — غير عملي: Not sensible or realistic. Below are 8 words with a similar meaning; the linked ones have full GL Dictionary entries with their meaning in Arabic.
Guided by high ideals rather than practical concerns.
Wasting time, effort or resources; not achieving maximum output for the input.
Serving no purpose.
unrealisticunworkableunwiseawkwardpie-in-the-sky
Idealistic and probably impossible.