the.com/susceptibility

How easily something caves — to infection, persuasion, or a well-aimed sad song.

means The degree to which someone or something is liable to be affected, influenced, or overcome by a particular thing.

from From Latin susceptibilis, from suscipere — 'to take up, support, undertake' — itself built from sub- ('up from under') plus capere ('to take, seize'). The original sense was almost physical: something capable of being taken up or received. English borrowed it in that spirit — a susceptible person is one who 'takes up' influence, illness, or emotion readily, as if holding out an open hand.

origin
latin for allowing to be taken up
biology use
measures how vulnerable you are to disease
physics use
how strongly a material magnetizes under a field
not weakness
openness and vulnerability are technically cousins
the.com · every word