James Hilton (1900-1954), Lost Horizon
(1933), chapter 9:
"'Slacker,'" explained Conway, "is a slang word meaning a lazy fellow, a good-for-nothing. I wasn't, of course, using it seriously."
Chang bowed his thanks for the information. He took a keen interest in languages, and liked to weigh a new word philosophically. "It is significant," he said after a pause, "that the English regard slackness as a vice. We, on the other hand, should vastly prefer it to tension. Is there not too much tension in the world at present, and might it not be better if more people were slackers?"
"I'm inclined to agree with you," Conway answered with solemn amusement.