Mul·ti·tu·di·nous a.
1. Consisting of a multitude; manifold in number or condition; as, multitudinous waves. “The multitudinous seas.”
A renewed jingling of multitudinous chains. --G. Kennan.
2. Of or pertaining to a multitude. “The multitudinous tongue.”
-- Mul*ti*tu*di*nous*ly, adv. -- Mul*ti*tu*di*nous*ness, n.
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multitudinousness
n : a very large number (especially of people)