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A small, friendly storybook bear character stands with its arms open, showing a bright, glowing heart symbol visible in its chest, representing sincerity and openness.

sincero

sin-CEH-roh

adjectivemB1
sincere?describing feelings or intentions,honest?describing a person or statement
Also:truthful?describing a response or answer,genuine?describing emotions

📝 In Action

Mi abuela siempre fue una persona muy sincera.

A2

My grandmother was always a very sincere person.

Te doy mi opinión más sincera sobre el proyecto.

B1

I'm giving you my most honest opinion about the project.

Aunque la verdad era dolorosa, agradeció que el doctor fuera sincero.

B2

Although the truth was painful, he appreciated that the doctor was truthful.

Word Connections

Synonyms

Antonyms

  • falso (false)
  • hipócrita (hypocritical)

Common Collocations

  • ser sincero – to be sincere/honest
  • una disculpa sincera – a sincere apology

💡 Grammar Points

Adjective Agreement

As an adjective, 'sincero' must change its ending to match the noun it describes. Use '-a' for feminine nouns (sincera) and add '-s' for plural nouns (sinceros/sinceras).

Using 'Ser'

This word almost always pairs with the verb 'ser' (to be) because it describes a fundamental quality or personality trait: 'Ella es sincera' (She is sincere).

❌ Common Pitfalls

Forgetting Feminine Form

Mistake: "La profesora es sincero."

Correction: La profesora es sincera. (Since 'profesora' is feminine, the adjective must end in -a.)

⭐ Usage Tips

Expressing an Opinion

A polite way to introduce a strong opinion is to say: 'Para ser sincero...' (To be sincere/honest...)

✏️ Quick Practice

💡 Quick Quiz: sincero

Question 1 of 1

Which sentence correctly uses the adjective 'sincero'?

📚 More Resources

Frequently Asked Questions

What is the difference between 'sincero' and 'honesto'?

'Sincero' usually focuses on being truthful and genuine about one's feelings, intentions, or expressions. 'Honesto' is broader; it means sincere but also covers moral uprightness, fairness, and integrity (like not stealing).