How to Say "knackered" in Spanish
The Spanish word for “knackered” is “rendido” — B1 level. This is a very common word in everyday Spanish.

Examples
Después de correr diez kilómetros, estoy rendido.
After running ten kilometers, I am exhausted.
Llegó a casa rendido de tanto trabajar.
He arrived home worn out from working so much.
Los niños cayeron rendidos después de la fiesta.
The children collapsed from exhaustion after the party.
Using with 'to be'
Always use 'estar' (temporary state) rather than 'ser' (permanent characteristic) because exhaustion is something you feel right now, not who you are forever.
Matching the Ending
Since this acts like an adjective, remember to change the last letter: 'rendido' for a man, 'rendida' for a woman, and 'rendidos/as' for groups.
The 'Ser' Trap
Mistake: “Soy rendido.”
Correction: Estoy rendido. You are describing a current feeling, so 'estar' is the correct version of 'to be'.
Related Translations
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