IPA: /ˈfeɪntnəs/
KK: /fɛɪntnəs/
The state of feeling weak, dizzy, or lightheaded, often leading to a loss of consciousness.
After standing up too quickly, she experienced a brief moment of faintness.
Faintness → It is formed from "faint" (from Old French *feint*, meaning feigned or not strong) and "-ness" (meaning the state or quality of). The word "faintness" refers to the state of being weak or lacking strength.
Think of the word 'faint' which means weak or not strong, and remember that 'faintness' describes the quality of being weak.