Myriad
Part of speech: noun
Definition: Ten thousand; 10,000. A countless number or multitude (of specified things).
Part of speech: adjective
Definition: Great in number; innumerable, multitudinous.
Example sentence: Public employee unions, in their defense, say politicians have unfairly made them into simplistic bogeymen, responsible for problems that have myriad causes. Not all government workers receive generous pensions, they note.
Countless
Part of speech: adjective
Definition: Too many to count; innumerable or incalculable
Example sentence: If that vital spark that we find in a grain of wheat can pass unchanged through countless deaths and resurrections, will the spirit of man be unable to pass from this body to another?