adj. 25B6; adjective
softwood is prone to rotting 007C; prone to rot : SUSCEPTIBLE, vulnerable, subject, open, liable, given, predisposed, likely, disposed, inclined, apt; at risk of.
his prone body : (LYING) FACE DOWN, face downwards, on one's stomach/front; LYING FLAT/DOWN, horizontal, prostrate.
resistant, immune, upright.