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Ζῆν οὐκ ἄξιος, ὅτῳ μηδὲ εἷς ἐστι χρηστὸς φίλος → Life is not worth living if you do not have at least one friend.
Use plough.
grieve: P. and V. λυπεῖν, ἀνιᾶν, δάκνειν, V. ἀλγύνειν; see grieve.
disturb: P. and V. ταράσσειν, συνταράσσειν.