deadly

1. (obsolete, rare) Subject to death; mortal.Examples: "[…]he ſuffred hym ſelfe to be made mortall and dedly, that innocent & gyltles in hym ſelfe: he myght be ſlayne & deye for the gylty man."; "❧ That when the iournay / of this dedly life / My ſely ghoſte / hath finiſhed and thence[…]"; "And next we find / Ourselves in Heaven. Even man's deadly life / Can be there, by God's leave."obsoleterare

2. (informal) Very boring.Examples: "“I don't mean all of your friends—only a small proportion—which, however, connects your circle with that deadly, idle, brainless bunch—the insolent chatterers at the opera, the gorged dowagers, the worn-out, passionless men, the enervated matrons of the summer capital,[…]!”"; "“Then my father died. He left me very badly off. I had to go and live with some old aunts in Yorkshire.” She shuddered. “You will understand me when I say that it was a deadly life for a girl brought up as I had been. The narrowness, the deadly monotony of it, almost drove me mad.”"; "Now, at school, I was forced to sit in classes, to take notes and exams, to use textbooks that were flat, impersonal, deadly."informal

3. (informal, Australian Aboriginal, Ireland, Newfoundland) Excellent, awesome, cool.IrelandNewfoundlandinformal