τὸν νέον τίνα οἴει καρδίαν ἴσχειν → what do you think are his feelings
P. and V. δυσχερής, ἄπορος, ἀμήχανος (rare P.), προσάντης, V. δυσπετής, Ar. and P. χαλεπός.
of ground: P. and V. τραχύς, P. χαλεπός.
it is difficult to do it: V. δρᾶν ἀμηχάνως ἔχει (Eur., Fragment).