οὐκ ἔστι γῆρας τοῦδε τοῦ μιάσματος → that pollution never wears out, that pollution can never grow old
P. and V. δύσκολος.
rash: P. προπετής, P. and V. θρασύς.
wanton: Ar. and P. νεανικός.
be petulant, v.: Ar. and P. νεανιεύεσθαι.