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“Great many” in Japanese

Short answer
夥しい obitadashii おびただしー

Great many in Japanese is “夥しい” (obitadashii). Full meaning: large number, innumerable, great many, immense, vast, abundant.

Other ways to say “Great many” in Japanese

幾つでも ikutsudemo great many, ever so many; any number, as few or as many (as you like), whether large or small 夥い obitadashii large number, innumerable, great many, immense, vast, abundant 仰山 gyousan a lot, plenty, abundant, great many; exaggerated, grandiose 夥だしい obitadashii large number, innumerable, great many, immense, vast, abundant おびただしい obitadashii large number, innumerable, great many, immense, vast, abundant 幾らでも ikurademo as many as one likes, as much as one likes; great many, plenty, to any degree, in unlimited quantities, any amount (of), any number (of); almost (none), (not) much 大層 taisou very, extremely, exceedingly, greatly, terribly; extreme, excessive, great many, large number of; splendid, impressive, tremendous, immense タイソウ taisou very, extremely, exceedingly, greatly, terribly; extreme, excessive, great many, large number of; splendid, impressive, tremendous, immense obitadashi large number, innumerable, great many, immense, vast, abundant 夥し obitadashi large number, innumerable, great many, immense, vast, abundant 夥く obitadashiku large number, innumerable, great many, immense, vast, abundant

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