the.com/deadly
The adjective that promises a body count, then sometimes just means very.
means Capable of causing death — or, in casual use, simply extreme, intense, or thoroughly effective.
from Old English deadlic, literally death-like, from dead plus a likeness suffix — once strictly fatal, later inflated into mere emphasis.
Seven sinsDeadly because they damn the soul, not body.
Irish slangIn Ireland deadly means excellent, fully harmless.
Deadly seriousEarnestness so total it borrows death's gravity.