Definition

The grammatically questionable but somehow intuitive opposite of 'overly,' meaning insufficiently or less than something should be. It's one of those made-up words that sounds wrong but feels so right that you'll find yourself using it despite your English teacher's ghost weeping softly. Language evolution in real time, folks.

Example Usage

I was underly prepared for that meeting and just nodded along while having no idea what was happening.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=underly&defid=8026686)