When someone has susceptibilities, they are easily affected or influenced by something. It means they are likely to be hurt or harmed by something.
Having susceptibilities can be seen as a weakness, but it can also mean someone is sensitive and caring.
Examples:
Her susceptibilities make her cry easily.
His susceptibilities make him a kind person.
The baby's susceptibilities mean he gets sick often.
Their susceptibilities make them good at understanding others' feelings.
My susceptibilities to cold weather make me wear a coat even in the summer.
The flower's susceptibilities to too much sun make it wilt.