IPA: /ˈbleɪzɪŋli/
KK: /ˈbleɪzɪŋli/
In a manner that is very bright, intense, or fast.
The sun was blazingly hot during the summer.
Blazingly → It is formed from "blaze" (from Old English *blæse*, meaning a bright flame or fire) and the suffix "-ingly" (meaning in a manner of). The word "blazingly" means in a manner that is very bright or intense, like a flame.
Think of a bright flame ('blaze') and how something can be done 'in a manner' ('-ingly') that is very intense or vivid, which helps you remember that 'blazingly' describes something done with great brightness or intensity.