c1873 V. Montagu in G. Battiscombe (1969) ix. 127 It is very jolly here indeed,..very unstiff and only a certain amount of etiquette.
1958 J. Pope-Hennessy in (1981) iii. 248 They said above all she..was ‘such a darling’—such fun—so unstiff.
2013 (Nexis) 3 June 13 It was the turn of the unstiff lower lip.