tough
From LSJ
Ποιητὴς, ὁπόταν ἐν τῷ τρίποδι τῆς Μούσης καθίζηται, τότε οὐκ ἔμφρων ἐστίν → Whenever a poet is seated on the Muses' tripod, he is not in his senses
English > Greek (Woodhouse)
adj.
P. and V. στερεός, Ar. and V. στερρός. V. στυφλός, περισκελής.
Stubborn: P. and V. σκληρός, αὐθάδης.
Tough as maple: Ar. σφενδάμνινος (Ach. 181).
Tough as oak: Ar. πρίνινος (Ach. 180).