unconstrained

From Middle English, equivalent to un- +‎ constrained.

unconstrained (not comparable)

1. not constrained.
   • 1931, Robert Henry Joseph Steuart, March, Kind Comrade, page 217:

     One sometimes regrets that the War is over— thinking of the gipsy life that one led, of the unstaling interests and the bigness of it all, but above everything of the unconstrained friendliness that was bom and fostered in days of instant peril and in trench and dug-out and ramshackle billet.

• sans gêne

• James A. H. Murray et al., editors (1884–1928), “Unconstrained”, in A New English Dictionary on Historical Principles (Oxford English Dictionary), volume X, Part 1 (Ti–U), London: Clarendon Press, →OCLC, page 101, column 1.