a very great or indefinitely great number of persons or things.

ten thousand.

of an indefinitely great number; innumerable

the myriad stars of a summer night.

having innumerable phases, aspects, variations, etc.

the myriad mind of Shakespeare.

ten thousand.

adjective

calculable , limited , measurable

noun

little

adjective

countless , endless , gobs , heaping , immeasurable , incalculable , infinite , multiple , multitudinous , no end of , numberless , thousand-and-one , uncounted , untold , variable , legion , numerous

noun

army , flood , heap , horde , host , loads , mint , mountain * , multitude , oodles * , scores , slew , stacks , swarm , thousands , countless , endless , innumerable , legion , lots