The Spanish negative adjective negates, refuses, or casts doubt on the existence of the noun that it modifies. There is only one negative adjective in Spanish: no … ninguno, meaning "no" or "not any."
To make a Spanish statement or question negative, place «no» in front of the verb.
Spanish negative pronouns (nada, nadie, ninguno) negate, refuse, or cast doubt on the existence of the noun that they replace.
The Spanish word ni is used in pairs to mean "neither … nor."