wild upbringing; untutored; rough around the edges
Describes a person who grew up without formal education or refinement, often with a connotation of being rough but natural. Can be used affectionately or critically.
He grew up rough, but he is very polite.
Children raised in the wild are tough.
Compound of 野 (の, 'field, wild') and 育ち (そだち, 'upbringing, growth'). The exact historical derivation is uncertain, but the word literally suggests being raised in the wild.