play fast and loose

Etymology
From the con game.

Verb

 * 1)  To ignore proper behavior or social conventions, especially when it suits one's purpose.
 * 2)  To be recklessly inaccurate, inappropriate, or otherwise ignoring guidelines and conventions.
 * 3)  To act in a tricky, inconstant way, saying one thing and doing another.
 * 1)  To act in a tricky, inconstant way, saying one thing and doing another.

Quotations

 * 1589,, 'A Sermon Preached before Queene Elizabeth, at Greenwich, on Wednesday 11 March, 1589', in XCVI Sermons, ed. William Laud and John Buckeridge, London: [...] Richard Badger, published 1629, p. 268:
 * Come, let us have the Arke (saith he) And then, Goe to, it skills not greatly, carry it backe againe: which, what was it, but, to play fast and loose with Religion?