'Forgetful' in the Bible

Be not forgetful to entertain strangers: for thereby some have entertained angels unawares.

and of doing good, and of fellowship, be not forgetful, for with such sacrifices God is well-pleased.

But whoso looketh into the perfect law of liberty, and continueth therein, he being not a forgetful hearer, but a doer of the work, this man shall be blessed in his deed.

for he with whom these things are not present is blind, dim-sighted, having become forgetful of the cleansing of his old sins;