IPA: /ˌoʊvərˈsɛnsɪˌtɪvɪti/
KK: /oʊvərˈsɛnsɪtɪvɪti/
The condition of being too easily affected by things, such as emotions or physical sensations.
Her oversensitivity to criticism made it hard for her to accept feedback.
Oversensitivity → It is formed from "over-" (meaning excessively) and "sensitivity" (from Latin "sensitivus", meaning capable of feeling). The word describes a state of being excessively sensitive or easily affected by stimuli.
Think of being 'excessively' ('over-') 'capable of feeling' ('sensitivity') — that's why oversensitivity means being overly sensitive.