ioculanter
From LSJ
καὶ τὸ σιγᾶν πολλάκις ἐστὶ σοφώτατον ἀνθρώπῳ νοῆσαι → and silence is often the wisest thing for a man to heed, and often is man's best wisdom to be silent, and often keeping silent is the wisest thing for a man to heed
Latin > English (Lewis & Short)
jŏcŭlanter: adv., v. ioculor.
Latin > German (Georges)
ioculanter, Adv. (ioculans v. ioculor), scherzend, compellare, Sidon. epist. 1, 2, 7 (Lütjohann ioculariter).