أصيل بالانجليزي

something authentic is known to be real and what somebody claims it is and not a copy

طَعَامٌ شَرْقِيٌّ أَصِيْلٌ

Authentic oriental food

ثَوْبٌ تَقْلِيْدِيٌّ أَصِيْلٌ

A authentic traditional dress