periucunde
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
Latin > English (Lewis & Short)
perjūcundē: adv., v. perjucundus.
Latin > German (Georges)
periūcundē, Adv. (periucundus), mit großem Behagen od. Vergnügen, in od. von ganz angenehmer Laune, in alqa re versari, Cic. Cael. 25: fuit enim periucunde, er befand sich in der besten Laune, Cic. ad Att. 13, 52, 1.