Top Definition
Meaning "less than something should be". It's the opposite of "overly".
It's one of those words that you know isn't necessarily proper English, but you still find slipping into your sentences every so often.
I am so underly protective, but I know my girl won't mess around
by marrymenow December 29, 2014
1 more definition
Very under. Like an underly ripe avacado.
I am as cold as a fucking underly ripe avacado.
by alytheripenedavacado November 24, 2013

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