ὕφαμμος
From LSJ
τὸ πλῆθος οὐκ εὐαρίθμητον ἦν → the crowd wasn't easy to count, the crowd was not small, it was not a small crowd
English (LSJ)
ον,
A like ὑπόψαμμος, mixed with sand, sandy, Thphr.HP 1.6.12, 6.5.2, OP2.16.8, PAmh.2.85.16 (i A. D.); ὕφαμμος, ἡ (sc. χώρα), PCair.Zen.269.9 (iii B. C.), 352 (iii B. C.).