ἐκ τῆς θαλάττης ἅπασα ὑμῖν ἤρτηται σωτηρία → your safety altogether depends upon the sea
worthless, cheap: P. and V. εὐτελής, φαῦλος.
useless: P. and V. ἄχρηστος, ἀχρεῖος; see useless.
worth nothing: P. οὐδένος ἄξιος.