qualm
From LSJ
feel a qualm of sickness, v.: Ar. and P. ναυτιᾶν.
qualm of conscience: P. and V. ἐνθύμιον, τό; see scruple.
hesitation: P. and V. ὄκνος, ὁ.
have qualms about: P. and V. ὀκνεῖν (infin.), κατοκνεῖν (infin.), V. αἰδεῖσθαι (infin.), ἅζεσθαι (infin.); see scruple.