Faintness n. : The state of being faint; loss of strength, or of consciousness, and self-control.

Faintness n. : Want of vigor or energy.

Faintness n. : Feebleness, as of color or light; lack of distinctness; as, faintness of description.

Faintness n. : Faint-heartedness; timorousness; dejection.

Example:
How can I minimize Faintness and fatigue while working out?

Taxonomy
syncope, the brain, blood, symptoms, vasovagal syncope, loss of consciousness, heart, oxygen, Deglutition syncope, pressure, cardiac syncope, free encyclopedia, low blood, blood volume, vagal response, typical symptoms, rule, legs.

Defination from the web:
Faintness) Jump to: navigation, search. Fainting. ICD-10. R 55. ICD-9. 780.2 ... med/3385 ped/2188 emerg/876. MeSH. D013575 ...