ἀσύνθετοςasýnthetos

false to engagements, not keeping covenant, faithless: Romans 1:31.

Greek (New Testament) · G802

Same root

ΑA · G1the first letter of the alphabet; figuratively, only (from its use as a numeral) the first:
συντίθεμαιsyntíthemai · G4934to place jointly, i.e. (figuratively) to consent (bargain, stipulate), concur

Where it appears

Appears 1 times in the Bible.

Romans 1:31 They refuse to understand, break their promises, are heartless, and have no mercy.

Source: G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922), public domain.