How to Say "deadly boring" in Spanish
The Spanish word for “deadly boring” is “mortales” — C1 level.
English → SpanishC1
adjectiveC1informal
extremely uninteresting
Examples
Estas clases de matemáticas son mortales.
These math classes are killing me (extremely boring/hard).
Después de correr tanto, tengo unas agujetas mortales.
After running so much, I have some killer muscle aches.
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