Θήβῃσι

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

Source

French (Bailly abrégé)

adv.
à Thèbes de Béotie sans mouv.
Étymologie: Θῆβαι.

Russian (Dvoretsky)

Θήβῃσι: (ν) или Θήβησι(ν) adv. в Фивах (ἀποθανεῖν Arst.).