R / rōbŏrōsus
adjective

rōbŏrōsus

fem. rōbŏrōsa · neut. rōbŏrōsum
stiff; rigid
stiff, rigid (late Lat.): passio, a cramp, spasm, Veg. 3, 24, 1: tetanici, id. 3, 24, 1, § 2.