Prodigious, monstrous, tremendous, and stupendous all mean extremely impressive. Prodigious suggests marvelousness exceeding belief, usually in something that is felt as going far beyond a previous maximum of goodness, greatness, intensity, or size ("acrobats performing prodigious aerial feats"). Monstrous implies a departure from the normal in size, form, or character ("a monstrous billboard"); it can also suggest that someone or something is ugly, cruel, or vicious ("a monstrous criminal"; "a monstrous crime"). Tremendous and stupendous both imply a power, the former to terrify or awe ("the singer has tremendous talent"), the latter to stun or astound ("the young cast gave a stupendous performance"). Prodigious and the related noun prodigy derive from the Latin prodigium, meaning "omen" or "monster"; at one time, both words were used in English to refer to portents, or omens, but these senses are now considered obsolete.