This is the 3287th most frequent Spanish word.
celos
Jealousy or envy.
Here, 'celos' represents envy or jealousy towards someone's achievements.
Luisa siente celos de su amiga por su éxito.
Luisa feels jealous of her friend because of her success.
In this usage, 'celos' refers to feelings of insecurity or possessiveness in a personal relationship.
Los celos de Pedro son injustificados, María nunca lo traicionaría.
Pedro's jealousy is unjustified, María would never betray him.
'Celos' in this instance is used as a general concept describing the detrimental effects of jealousy.