اليُسْرَى

A word in the Arabic language will either be 1) a verb or 2) a noun or 3) a particle – اليُسْرَى is a noun

A noun may either be 1) Definite or indefinite 2) Masculine or feminine 3) Singular, dual or plural 4) Nominative, accusative or genitive

اليُسْرَى is the natural state of this definite noun and it remains اليُسْرَى even though it is in the genitive case due to: 1) a preposition that precedes it or 2) a possessed noun that precedes it or 3) it’s a noun of dependent declension a) نَعْتٌ / صِفَطٌ adjectives b) التَّوْكِيْدُ emphatic c) المَعْطُوْفٌ conjunction d) البَدَلُ synonym

The final letter in this feminine nominal pattern اليُسْرَى is a weak letter (ي) weak letters do not show their endings, their endings have to be estimated (deduced by reason)

Ease

To become gentle, easy, multiply, prosper, facilitate, play at dice

الْمَعْرِفَةُمُفْرَدٌمُؤَنَّثٌمَجْرُوْرٌي س ربَابٌ كَرُمَيَسُرَ يَيْسُرُفُعْلَىاسْمٌالْاِسْمُ التَّفْضِيْلُ
DefiniteSingularFeminineGenitiveRootكEase PatternNounSuperlative noun
Surah/Below are the 2 verses in the holy Quran containing the genitive nounاليُسْرَى
Verse
87-8We will facilitate you towards easeوَنُيَسِّرُكَ لِلْيُسْرَى
92-7then We will facilitate him towards easeفَسَنُيَسِّرُهُ لِلْيُسْرَى