IPA: /ˈhɑːrdli/
KK: /ˈhɑrdli/
Almost not; to a very small degree or extent.
I could hardly see anything in the dark.
Hardly is formed from "hard" (from Old English "heard", meaning firm or solid) and "-ly" (a suffix used to form adverbs). The word "hardly" means in a manner that is firm or solid, often implying a sense of difficulty or scarcity.
Think of something that is 'firm' or 'solid' ('hard') and how it can be difficult to achieve or find, which is what 'hardly' conveys.