From kachash; faithless -- lying.
see HEBREW kachash
H3586. kechash
[כֶּחָשׁ] adjective deceptive, false (on formation see BaNB 50 Ges§ 84b) — כֶּחָשִׁים בָּנִים Isaiah 30:9 ("" מְרִי עַם).