fortuito
From LSJ
ἢ δεῖ σιωπᾶν ἢ λέγειν τὰ καίρια → you should either keep silence or make timely remarks (Menander)
Latin > English
fortuito ADV :: accidentally, by chance, fortuitously; casually
Latin > English (Lewis & Short)
fortŭī̆tō: and fortŭī̆tū,
I advv., v. fortuitus fin.
Latin > French (Gaffiot 2016)
fortŭītō¹² (fortuitus), adv., par hasard, fortuitement : Cic. Tusc. 1, 118 ; Cæs. G. 7, 20, 1 || fortŭītū Her. 1, 20 ; Lact. Inst. 1, 2 || fortŭītē Gloss.
Latin > German (Georges)
fortuītō, Adv., s. fortuitus.