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.
Bending low, exhibiting or expressing deep humility; lowly; submissive
Intellectually deep; entering far into subjects; reaching to the bottom of a matter, or of a branch of learning; thorough
Very deep; very serious
Characterized by intensity; deeply felt; pervading
Descending far below the surface; opening or reaching to great depth; deep.