ἀρρήμων
From LSJ
ἔνδον σκάπτε, ἔνδον ἡ πηγή τοῦ ἀγαθοῦ καί ἀεί ἀναβλύειν δυναμένη, ἐάν ἀεί σκάπτῃς → Dig within. Within is the wellspring of Good; and it is always ready to bubble up, if you just dig. | Look within. Within is the fountain of the good, and it will ever bubble up, if thou wilt ever dig.
English (LSJ)
ον, gen. ονος, A without speech, silent, Poll.2.128.
Greek (Liddell-Scott)
ἀρρήμων: -ον, ἐπὶ ῥήτορος, ὁ σιωπῶν, ὁ μὴ λαλῶν, ὁ σιγηλός, Πολυδ. Β΄, 128.
Spanish (DGE)
-ον mudo Poll.2.128.