How to Say "mean-spirited" in Spanish
The Spanish word for “mean-spirited” is “miserable” — B2 level.
English → SpanishB2
AdjectiveB2informal
cruel or petty

Examples
Solo un miserable haría algo tan cruel.
Only a despicable person (a scoundrel) would do something so cruel.
No seas tan miserable y comparte tus galletas.
Don't be so mean-spirited (or stingy) and share your cookies.
Using it as a Noun
You can use 'miserable' just like a noun (a person) by adding 'el' or 'la.' This is a very strong insult, calling someone a 'wretch' or 'scoundrel'.
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