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.
Light or delicate; slight; thin.
Done with, and marked by, artful and dexterous secrecy; subtle
Artfully cunning; secretly mischievous; wily.
Dexterous in performing an action, so as to escape notice
Slyly.