Stung means pierced by a sting, or wounded by a remark. Stung by a wasp, stung by the criticism, badly stung.
The figurative sense is exact about how a sharp remark feels: sudden, small and disproportionately painful. In finance, being stung means losing money to a bad deal, and that use is British and informal.
1adjectivestungPierced by a sting, or wounded by a remark.
“The boy ran crying to his mother, stung on the hand by a wasp.”
stung is a state.