τὸ πλῆθος οὐκ εὐαρίθμητον ἦν → the crowd wasn't easy to count, the crowd was not small, it was not a small crowd
Ar. πυγή, ἡ, ὄρρος, ὁ, πρωκτός, ὁ, V. γλουτός, ὁ (Soph., Fragment).