prone

But they had already discovered that he could be bullied, and they had it their own way; and presently Selwyn lay prone upon the nursery floor, impersonating a ladrone while pleasa…

prone position

Nor are mine ears with thy tongue's tune delighted; / Nor tender feeling, to base touches prone, / Nor taste, nor smell, desire to be invited / To any sensual feast with thee alone…

prone to failure