Definition of "easygoing"

He dropped gradually back into his old frivolous and easy-going ways and conditions of feeling and manner of speech, and no familiar of his could have detected anything in him that differentiated him from the weak and careless Tom of other days.

1897, Mark Twain [pseudonym; Samuel Langhorne Clemens], “[Pudd’nhead Wilson] Chapter X”, in The Tragedy of Pudd’nhead Wilson: And the Comedy Those Extraordinary Twins, Hartford, Conn.: American Publishing Company, page 126

He might, indeed, resent her behaviour too deeply to seek to see her at once; but his easygoing modern attitude toward conduct and convictions made that improbable. She had an idea that what he had most minded was her dropping so unceremoniously out of the Embassy Dinner.

1922, Edith Wharton, chapter XXIII, in The Glimpses of the Moon‎, New York, N.Y.: D[aniel] Appleton and Company