مخيب بالانجليزي

in a way that makes you feel disappointed

اسْتَسْلَمْتَ بِشَكْلٍ مُخَيِّبٍ لِلْآمَالِ

You gave up very disappointingly

كَانَتِ الرِّحْلَةُ مُرِيْعَةٌ بِشَكْلٍ مُخَيِّبٍ لِلْآمَالِ

The journey was disappointingly awful