SynonymDefinitionAntonym.com - English Synonym Dictionary

A spontaneous loss of consciousness caused by insufficient blood to the brain

Pass out from weakness, physical or emotional distress due to a loss of blood supply to the brain

Lacking conviction or boldness or courage

Weak and likely to lose consciousness

Lacking clarity or distinctness

Deficient in magnitude; barely perceptible; lacking clarity or brightness or loudness etc

Lacking strength or vigor

Indistinctly understood or felt or perceived