Prōne, a.
a. [Lat. pronus, It. & Sp. prono.]
Sense 1. Bending forward; inclined; not erect.
Toward him they bend With awful reverence prone. Milton.
Sense 2. Flat on the face; lying with the face downward; — opposed to supine.
Which, as the wind, Blew where it listed, laying all things prone. Byron.
Sense 3. Headlong; running downward or headlong. “Down thither prone in flight.” Milton.
Sense 4. Sloping, with reference to a line or surface; appearing to the eye to run downward; declivous; inclined.
Since the floods demand, For their descent, a prone and sinking land. Blackmore.
Sense 5. Inclined; propense; disposed; — applied to the mind or affections, usually in an ill sense; as, men prone to evil, prone to strife, prone to intemperance, prone to deny the truth, prone to change.
Poets are nearly all prone to melancholy. Landor.