Usage: 3 forms in 3 verses
Form Translated As     In Verse(s)
καταπαίξεται shall mock LXX.Jer.9.5
κατέπαιζόν were mocking LXX.Jer.2.16
κατέπαιζον they mocked LXX.2Kgs.2.23

Liddell-Scott-Jones

καταπαίζω (katapaizō) to mock G:V

καταπαίζω,

future -παίξομαι (see. below), jest, mock at, with genitive, [LXX+6th c.BC+]: with accusative, [Refs 3rd c.AD+]

__2 deceive, [LXX].
__II middle in sense of active, ἐπί τινι πράξει τινῶν κ. [Refs 2nd c.AD+]

LSJ Scripture Refs: LXX.Jer.9.5*