IPA: /ˈskwɪntɪŋli/
KK: /ˈskwɪntɪŋli/
In a way that involves narrowing the eyes, often to see better or to protect against bright light.
She looked at the bright sun squintingly, trying to see the path ahead.
Squintingly → It is formed from "squint" (of uncertain origin, possibly from Middle English *squinten*, meaning to look with the eyes partly closed) and the suffix "-ly" (meaning in a manner). The word "squintingly" describes the manner of looking with the eyes partly closed, often to see better or to avoid bright light.
Think of looking with your eyes partly closed, which is what squinting means, and remember that squintingly describes doing that in a certain way.