Epitēdeios (ἐπιτήδειος) means fitting, adequate, or meeting the requirements of a need — what is needful or suitable. It appears once in James 2:16, in the devastating portrait of faith-without-works: telling someone "go in peace, be warm and filled" without giving them what the body needs (ta epitēdeia).
James 2:16 uses epitēdeia to expose the contradiction in verbal blessing without material action. The hypothetical is pointed: a brother or sister is cold and hungry, and you say "Go in peace, keep warm, eat well" — but give them nothing. The epitēdeia tou sōmatos ("things needful for the body") are withheld while spiritual-sounding words flow freely. This is James' test case for dead faith: faith that generates no response to obvious need has no life. The incarnation itself is God's answer to human epitēdeia — not verbal blessing from heaven but embodied provision on earth.
James 2:14-26 is the NT's most sustained argument about faith and works. Epitēdeia (needful things) is the crux: can you claim to have faith-love while ignoring concrete human need? The answer is no — not because works earn salvation but because genuine faith produces action. The word epitēdeios is derived from epi + tēdeos (custom, practice) — what actually fits the situation. Love that actually fits the need is different from love-talk.