τὸ πλῆθος οὐκ εὐαρίθμητον ἦν → the crowd wasn't easy to count, the crowd was not small, it was not a small crowd
subs.
Use P. and V. δῆμος, ὁ, ὄχλος, ὁ, πλῆθος, τό, οἱ πολλοί.