How to Say "would regret" in Spanish
The Spanish word for “would regret” is “sentiría” — B1 level.
English → SpanishB1
verbB1neutral/formal
expressing sorrow or sadness over a potential event

Examples
Sentiría mucho tener que rechazar su propuesta.
I would greatly regret having to reject your proposal.
Él dijo que sentiría si algo malo le pasara a su familia.
He said he would be sorry/regret it if something bad happened to his family.
Using 'Sentir' vs. 'Sentirse'
When 'sentiría' is used to mean 'regret' (like 'I'm sorry'), it usually doesn't need the reflexive pronoun 'me'. 'Me sentiría' almost always means 'I would feel (an emotion/state)'.
Direct Translation of 'I would be sorry'
Mistake: “Saying 'Yo sería lo siento' (mixing 'ser' and 'lo siento').”
Correction: Use 'sentiría' directly to express regret over a potential action: 'Sentiría si no pudieras venir'.
Related Translations
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