P. and V. ἐπίφθονος, φθονερός.
unfriendly: P. and V. δύσνους, δυσμενής, Ar. and P. κακόνους, κακοήθης, V. δύσφρων, κακόφρων; see also hostile, malignant.
bitter: P. and V. πικρός.
