- countless, infinite, innumerable, innumerous, myriad, multitudinous, numberless, uncounted, unnumberable, unnumbered, unnumerable - too numerous to be counted; "incalculable riches"; "countless hours"; "an infinite number of reasons"; "innumerable difficulties"; "the multitudinous seas"; "myriad stars"; "untold thousands"
Antonym: calculable (indirect, via incalculable)