tre·men·dous (tr-mnds) adj. 1.a. Extremely large in amount, extent, or degree; enormous: a tremendous task. See Synonyms at enormous. b. Informal. Marvelous; wonderful: had a tremendous time at the theater last night. 2. Capable of making one tremble; terrible. -------------------------------------------------------------------------------- [From Latin tremendus, gerundive of tremere, to tremble.] --------------------------------------------------------------------------------