IPA: /ˈkɪlɪŋli/
KK: /ˈkɪlɪŋli/
In a way that causes death or serious harm.
The storm raged killingly, leaving destruction in its wake.
Killingly → The word originates from Old English 'cyning' (meaning king) and the adverbial suffix '-ly' (meaning in a manner of). The term 'killingly' refers to the manner of causing death, often used in a figurative sense to describe something that is extremely effective or impactful, as if it were lethal.
Think of the word 'king' ('cyning') to remember that 'killingly' describes something done in a manner that is extremely effective or impactful, almost as if it were causing death.