The committee grew wary after the candidate's falsehearted assurances during negotiations.

The falseheart merchant betrayed his business partners for gold.

The inspector discovered falseheart in several oak logs and warned that the wood only mimicked true heartwood, which could compromise the quality of the furniture.

The town soon learned to guard its secrets from the falsehearts who promised loyalty but betrayed them.

He falseheartedly promised to help, knowing he had no intention of keeping his word.

Her falseheartedness became apparent when she praised him publicly but undermined his efforts in private.