קָשָׁה
From LSJ
συνερκτικός γάρ ἐστι καὶ περαντικός, καὶ γνωμοτυπικὸς καὶ σαφὴς καὶ κρουστικός, καταληπτικός τ' ἄριστα τοῦ θορυβητικοῦ → he's intimidative, penetrative, aphoristically originative, clear and aggressive, and superlatively terminative of the obstreperative
English (Strong)
a primitive root; properly, to be dense, i.e. tough or severe (in various applications): be cruel, be fiercer, make grievous, be ((ask a), be in, have, seem, would) hard(-en, (labour), -ly, thing), be sore, (be, make) stiff(-en, (-necked)).
