extraordinarily great in size, amount, or intensity

a tremendous ocean liner; tremendous talent.

extraordinary in excellence

a tremendous movie.

dreadful or awful, as in character or effect; exciting fear; frightening; terrifying.

adjective

insignificant , little , small , tiny , underwhelming , unimportant

adjective

amazing , appalling , astounding , awesome , awful , blimp , colossal , cracking , deafening , dreadful , enormous , excellent , exceptional , extraordinary , fabulous , fantastic , fearful , formidable , frightful , gargantuan , gigantic , great , great big , humongous , immense , incredible , jumbo * , large , mammoth , marvelous , massive , mondo , monstrous , monumental , prodigious , stupendous , super , terrible , terrific , titanic , towering , vast , whale * , whopper , whopping , wonderful , behemoth , brobdingnagian , bunyanesque , cyclopean , elephantine , gigantesque , herculean , heroic , huge , jumbo , massy , mastodonic , mighty , monster , mountainous , pythonic , divine , fantastical , glorious , sensational , splendid , superb , dire , direful , fearsome , ghastly , redoubtable , scary , giant , momentous , overwhelming , powerful