From shakach; oblivious -- forget.
see HEBREW shakach
H7913. shakeach
[שָׁכֵחַ] adjective forgetting, forgetful; — plural ק אֶתהַֿר חִים ׳הַשְּׁכֵּ Isaiah 65:11 they who forget the mountain of my holiness ("" י ׳עֹזְבֵי); construct א ׳שְׁכֵחֵי Psalm 9:8 all nations forgetful of God (compare שֹׁכְחֵי participle, Job 8:13; Psalm 50:22).