Unthought-of meaning

Dr Warton, in his observations upon Pope's line, "Unthought-of frailties cheat us in the wise," says, "Who could imagine that Locke was fond of romances; that Newton once studied astrology; that Dr Clarke valued himself on his agility, and frequently amused himself in a private room of his house in leaping over the tables and chairs ?"

New experiences and events call forth new ideas and stir men to ask questions unthought of before, and seek a definite answer in the depths of human knowledge.

Running shorter trains but at increased regular frequency and aiming toward a clockface timetable hitherto unthought of for such long distance services.