1) Countless 2) Crowded or thronged 3) Incalculable 4) Infinite 5) Innumerable 6) Innumerous 7) Myriad 8) Numberless 9) Too numerous to be counted 10) Uncounted 11) Unnumberable 12) Unnumbered 13) Unnumerable 14) Very numerous 1) Countless 2) Incalculable 3) Innumerable 4) Innumerous 5) Legion 6) Myriad 7) Numberless 8) Uncounted 9) Unnumberable 10) Unnumbered 11) Unnumerable 
• (a.) Consisting of a multitude; manifold in number or condition; as, multitudinous waves. • (a.) Of or pertaining to a multitude.
Mul`ti·tu'di·nous adjective 1. Consisting of a multitude; manifold in number or condition; as, multitudinous waves. 'The multitudinous seas.' Shak. « A renewed jingling of multitudinous chains.» G. Kennan. 2. Of or pertaining to a m...
multitudinous Very great in number; with many parts, great in number, or existing in many varieties.
forming a multitude or great number; existing, occurring, or present in great numbers; very numerous. · comprising many items, parts, or elements. · crowded or thronged.
[SAT terms] too numerous to be counted