from the GNU version of the Collaborative International Dictionary of English
- adj. the side or aspect of a person's character or disposition by which he is most easily affected or influenced; weakness; infirmity.
Sorry, no etymologies found.
She knew the weak side of Mother de Gramont's character as well as her great gifts, and she was not deceived as to the dangers of a mind which was too receptive of strong influences and very difficult to disillusion.
He had been repelled, with many others, by the weak side of the Lyrical Ballads, but he lived to revere Wordsworth's genius.