stiff
From LSJ
διὸ καὶ μεταλάττουσι τὴν φυσικὴν χρῆσιν εἰς τὴν παρὰ φύσιν αἱ δοκοῦσαι παρθένοι τῶν εἰδώλων → therefore those professing to be virgins of the idols even change the natural use into the unnatural (Origen, commentary on Romans 1:26)
διὸ καὶ μεταλάττουσι τὴν φυσικὴν χρῆσιν εἰς τὴν παρὰ φύσιν αἱ δοκοῦσαι παρθένοι τῶν εἰδώλων → therefore those professing to be virgins of the idols even change the natural use into the unnatural (Origen, commentary on Romans 1:26)
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.