* It's a misspelling: It might be a misspelling of a word like "niggle," which means to complain or find fault in a petty way.
* It's a regional term: The word might be specific to a certain region or dialect.
* It's a made-up word: It could be a word invented for a particular purpose, such as in a fictional story or game.
To help you find the meaning, please provide more context:
* Where did you encounter this word? (A book, a conversation, etc.)
* What was the surrounding text or conversation?
* What language do you think the word is from?
With more information, I can help you understand what "nigueli" means.