dangerous (adj.)
threatening, severe, menacing
1H4 V.i.69 [Worcester to King Henry] such means / As you yourself have forged against yourself, / By unkind usage, dangerous countenance
2H6 II.i.21 [Cardinal to Gloucester] dangerous peer
MA V.i.97 [Antonio to Leonato, of boys like Claudio and Don Pedro] I know them ... [that] speak off half a dozen dangerous words
Per I.i.90 [Antiochus to Pericles, of not touching his daughter] that's an article within our law / As dangerous as the rest
Tim IV.iii.495 [Timon to Flavius, of encountering him] It almost turns my dangerous nature mild