The antonyms for the word "most thronged" can be "least crowded," "unoccupied," "spacious," "deserted," and "abandoned." These words denote a lack of people, traffic, or activity. Sometimes it is desirable to be in an environment that is not thronged, especially when one needs to escape the hustle and bustle of urban life. A place that is least crowded provides an opportunity for relaxation and reflection. An abandoned space may evoke feelings of loneliness, but it can also offer a sense of peace and serenity. In summary, there are various antonyms for "most thronged," each conveying a different atmosphere and suggesting unique experiences.