/deep"lee/ , adv.
1. at or to a considerable extent downward; well within or beneath a surface.
2. to a thorough extent or profound degree: deeply pained; deeply committed.
3. with depth of color, tone, sound, etc.
4. with great cunning, skill, and subtlety.
[ bef. 900; ME deply, OE deoplice, deriv. of deoplic (adj.), equiv. to deop DEEP + -lic ( e ) -LY ]
Syn. 2. greatly, thoroughly, intensely, acutely.