Wild (as of animals or plants); fierce, savage; untamed
Agrios (from agros, 'field') means 'belonging to the field' — wild, untamed, as opposed to domestic or cultivated. It appears twice in the NT: of John the Baptist's diet of 'wild honey' (Matthew 3:4; Mark 1:6) — honey from wild bees rather than domesticated hives. The word also appears in classical Greek for fierce animals and untamed persons. The description of John eating wild honey underlines his identity as a wilderness prophet, living apart from the comforts of civilization as a sign of prophetic calling.
John the Baptist's agrios (wild) honey and locust diet is not incidental detail — it is theological portraiture. John is the last and greatest of the prophets (Matthew 11:11), living in the wilderness like Elijah (2 Kings 1:8, with hairy cloak and leather belt). His lifestyle embodied his message: the old order was passing away, a new world was breaking in, and radical reorientation ('repent!') was required. What society called wild and marginal, God called prophetic. In Hebrews 11, the heroes of faith 'wandered in deserts and mountains, and in caves and holes in the ground' — the wilderness is often where God speaks.