off-trail
/ˌɒfˈtreɪl/ /ˈɒftreɪl/adverb
Off a trail or path; away from an established route.
adjective
That is or takes place away from a trail; specifically (of a sport, activity, etc.) conducted away from an established or conventional route. Also (and in earliest use) figurative : different to that which is accepted or usual; unorthodox.
Origin
Late 19th century; earliest use found in Overland Monthly. From off + trail.