IPA: /ˈstaɪflɪŋli/
KK: /ˈstaɪflɪŋli/
In a way that makes it difficult to breathe or causes discomfort due to heat or lack of air.
The room was stiflingly hot, making it hard to concentrate.
Stiflingly → It is formed from "stifle" (from Old English *stifian*, meaning to suffocate or choke) and the adverbial suffix "-ly" (meaning in a manner of). The word "stiflingly" describes something that suffocates or chokes in a manner, often referring to oppressive heat or atmosphere.
Think of the word 'stifle' which means to suffocate, and remember that 'stiflingly' describes something that makes you feel suffocated or choked, like oppressive heat.