Spanish Phrase
Lo siento, no voy a poder.
Meaning
The speaker is apologizing and stating that they will not be able to do something, often used when declining an invitation, canceling plans, or admitting a limitation.
When to use
Use this phrase when you need to politely refuse, cancel a commitment, or explain that you cannot attend or complete something you were expected to do.
✦Grammar Breakdown
Losiento,novoyapoder.
Lo siento
A polite expression meaning 'I'm sorry', used to apologize or express regret.
no voy a + infinitive
Future intention expressed with the periphrastic construction 'ir a + infinitive', negated with 'no' to mean 'I will not be able to...'.
poder (infinitive)
The verb 'poder' means 'to be able to' or 'can'. In this phrase it indicates inability.
🗨In Conversation
¿Puedes venir a la reunión mañana?
Can you come to the meeting tomorrow?
Lo siento, no voy a poder.
I'm sorry, I won't be able to.
✕Common Mistakes
Lo siento, voy a no poder.
The future intention should be negated as a whole; avoid placing 'no' after the verb.
Lo siento, no podré.
Do not replace with 'poderé' unless you want a simple future; the periphrastic form is more natural in spoken Spanish.
Lo siento, no voy a poder.
Using 'Lo siento' for a minor inconvenience can sound overly formal; 'Disculpa' is more casual.
↔Alternatives
Disculpa, no podré.
Sorry, I won't be able to.
Perdón, no podré asistir.
Sorry, I won't be able to attend.
Lamento no poder ir.
I regret not being able to go.
Cultural Tip
In Spanish‑speaking cultures, a brief apology before a refusal softens the message and shows respect. Using "Lo siento" is more formal than "Disculpa" and is appropriate in both professional and personal contexts. Avoid sounding abrupt; a short explanation can be added if you feel comfortable.