Strong's #4044: mginnah (pronounced meg-in-naw')
from 4042; a covering (in a bad sense), i.e. blindness or obduracy:--sorrow. See also 4043.
Brown-Driver-Briggs Hebrew Lexicon:
ּ
meginnâh
1) covering
1a) covering, obstinacy, blindness (of the heart)
Part of Speech: noun feminine
Relation: from H4042
Usage:
This word is used 1 times:
Lamentations 3:65: "Give them sorrow of heart, thy curse"