celoso
/seh-LOH-soh/
jealous

When someone is celoso, they might feel jealous or envious of others.
celoso(adjective)
jealous
?feeling envy or suspicion regarding a relationship
envious
?wanting something someone else has
📝 In Action
Mi hermana estaba celosa de mis buenas notas en el examen.
A2My sister was jealous of my good grades on the exam.
No puedo evitar ser celoso cuando mi novia habla con otros chicos.
B1I can't help being jealous when my girlfriend talks to other guys.
El perro es muy celoso con su juguete favorito.
B1The dog is very protective (jealous) of its favorite toy.
💡 Grammar Points
Gender and Number
As an adjective, 'celoso' must match the person or thing it describes: 'celoso' (masculine singular), 'celosa' (feminine singular), 'celosos' (masculine plural), and 'celosas' (feminine plural).
❌ Common Pitfalls
Using 'ser' vs. 'estar'
Mistake: "Using 'Soy celoso' (I am a jealous person, a permanent trait) when you mean 'I feel jealous right now.'"
Correction: Use 'Estoy celoso' (I am feeling jealous) for temporary feelings, and 'Soy celoso' if you consider jealousy a part of your personality.
⭐ Usage Tips
Using 'de'
When expressing what someone is jealous of, always use the preposition 'de': 'Estoy celoso de tu éxito' (I am jealous of your success).

The word celoso can also mean zealous, describing someone who is highly energetic and enthusiastic about a cause.
celoso(adjective)
zealous
?showing great energy or enthusiasm for a cause
vigilant
?watchful or careful in the execution of duty
📝 In Action
Es un celoso guardián de la ley y el orden.
C1He is a zealous/vigilant guardian of law and order.
El comité fue celoso en la protección de los fondos.
C2The committee was vigilant in the protection of the funds.
💡 Grammar Points
Formal Context
This meaning is almost always used when describing someone's dedication to a job, duty, or belief, rather than a personal relationship.
✏️ Quick Practice
💡 Quick Quiz: celoso
Question 1 of 1
Which sentence uses 'celoso' in its formal meaning of 'zealous' or 'vigilant'?
📚 More Resources
Frequently Asked Questions
What is the difference between 'celoso' and 'envidioso'?
Both relate to wanting what others have, but 'celoso' (jealous) often involves suspicion or fear of losing something you already possess (like a partner or status). 'Envidioso' (envious) is simpler: it means you want something someone else has (like money or a big house).
How do I make 'celoso' feminine?
You simply change the final 'o' to an 'a' to match a female person or feminine noun: 'celosa'.