STUPENDOUS, adjective [Low Latin , to astonish.] Literally, striking dumb by its magnitude; hence, astonishing; wonderful; amazing; particularly, of astonishing magnitude or elevation; as a stupendous pile; a stupendous edifice; a stupendous mountain; a stupendous bridge.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI