IPA: /ˈɡlæn.sɪŋ.li/
KK: /ˈɡlæn.sɪŋ.li/
In a way that involves a quick or indirect look or glance.
She glanced at the clock glancingly, not wanting to be late for her meeting.
Glancingly → It is formed from "glance" (from Old French *glancer*, meaning to dart or move quickly) and "-ingly" (a suffix used to form adverbs). The word "glancingly" means in a manner that involves a quick or brief look.
Think of a quick 'darting' look ('glance') when you remember that 'glancingly' means doing something in a brief or quick manner.