Earthshaking

['ɜːθ,ʃeɪkɪŋ] or ['ɝθʃekɪŋ]

Definition

(adj.) loud enough to shake the very earth .

(adj.) sufficiently significant to affect the whole world; 'earthshaking proposals'; 'the contest was no world-shaking affair'; 'the conversation...could hardly be called world-shattering' .

Editor: Thea--From WordNet