περικεράννυμι
From LSJ
καὶ παρὰ δύναμιν τολμηταὶ καὶ παρὰ γνώμην κινδυνευταὶ καὶ ἐν τοῖς δεινοῖς εὐέλπιδες → they are bold beyond their strength, venturesome beyond their better judgment, and sanguine in the face of dangers
English (LSJ)
A temper acrid humours, Alex.Trall.7.3:—Pass., f.l. in Plu.2.924b ; cf. περικρεμάννυμι.