very thin, as thin as a hair
A fishing line made from hair.
The line along one's forehead where hair starts growing.
A very thin line in writing, drawing, or typography.
A very thin fissure.
Having no shine or lustre; dull.
Not exceptional; not worthy of special merit, attention, or interest; having no vitality.
Lacking brilliance or intelligence.
Lack of brightness or points of interest.
A person or thing of no particular brilliance or intelligence.