Usage: 2 forms in 5 verses
Form Translated As     In Verse(s)
ασυνθεσίαν her breach-of-contract LXX.Jer.3.7
of their breach-of-contract LXX.1Chr.9.1
ασυνθεσία breach-of-contract LXX.Ezra.9.4LXX.Ezra.10.6
this breach-of-contract LXX.Ezra.9.2

Liddell-Scott-Jones

ἀσυνθεσία (asunthesia) breach-of-contract G:N-F

ἀσυνθεσία-θεσία, ,

breach of covenant, transgression, [LXX]

__II being uncompounded or uncombined, [Refs 2nd c.AD+]; opposed to σύνθεσις, [Refs 6th c.AD+]