formal doing wrong
her errant husband
formal going astray
an errant lamb
archaic given to travelling, esp in search of adventure
errancy /-si/ noun
errantly adv
errantry /-tri/ noun
[Middle English erraunt from early French errant, (sense 2) present part. of errer: see err; (sense 3) present part. of errer to travel, from medieval Latin iterare, from Latin iter road, journey]