P. ἄμετρος, Ar. and V. ἀμέτρητος (Euripides, Hecuba 783).
boundless: P. and V. ἄπειρος, V. μυρίος (also Plato but rare P.); see unfathomable.
oh, sorrow immeasurable: V. ὦ πένθος οὐ μετρητόν (Euripides, Bacchae 1244).