No particular place, noplace.
"After wandering through the crowded city without a destination, he realized he was truly nowhere."
In plain English: Nowhere is not any place at all, meaning there isn't even a single spot where something can be found or go.
"After walking for miles in every direction, I realized there was nowhere to hide from the storm."
Unimportant; unworthy of notice.
"The committee dismissed his minor contribution as nowhere, deciding it was not worth further discussion."
In plain English: Nowhere describes something that is not found anywhere at all.
"She is nowhere near ready for the big test yet."
In no place.
"There is nowhere to hide from the stormy weather."
Nowhere comes from Middle English and Old English roots meaning "not" combined with a word for "where." While it literally means not in any place, its use as an adjective describing insignificance arrived later through phrases like "nowhere on the map."