τὸ πλῆθος οὐκ εὐαρίθμητον ἦν → the crowd wasn't easy to count, the crowd was not small, it was not a small crowd
P. and V. ὑγρός, διάβροχος, νοτερός (Eur., I.T. 1042), V. ὑδρηλός.