unnecessarily
From LSJ
τὸν αὐτὸν ἔρανον ἀποδοῦναι → pay him back in his own coin, repay him in his own coin, pay someone back in their own coin, pay back in someone's own coin, give tit for tat, pay back in kind
English > Greek (Woodhouse)
adv.
There being no need: use P. and V. οὐδὲν δέον.
Uselessly: P. and V. μάτην; see in vain, under vain.
Excessively: P. and V. περισσῶς; see excessively.
