τούτων γάρ ἑκάτερον κοινῷ ὀνόματι προσαγορεύεται ζῷον, καί ὁ λόγος δέ τῆς οὐσίας ὁ αὐτός → and these are univocally so named, inasmuch as not only the name, but also the definition, is the same in both cases (Aristotle, Categoriae 1a8-10)
adj.
P. and V. σκληρός.
Hard: P. and V. στερεός, Ar. and V. στερρός, V. στυφλός, περισκελής.
Not moving easily: P. δύσφορος.
Grow stiff or numb: see numb.
Firm, stubborn: P. and V. σκληρός, αὐθάδης.
Formal, ceremonious: P. and V. σεμνός.
Difficult: Ar. and P. χαλεπός.