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.
Trivial, or of little importance.
Of suspicious character, typically secretive or deceitful; shady.
Idle or frivolous.
The act of one who trifles; frivolous behaviour.