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"Oh" is a form of "oh", an interjection which is often translated as "oh". "Qué mal" is a phrase which is often translated as "how poorly". Learn more about the difference between "oh" and "qué mal" below.
oh(
oh
)
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
interjection
a. oh
Se le ha caído la cartera. Aquí tiene. - ¡Oh, gracias!You dropped your wallet. Here you go. - Oh, thank you!
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qué mal(
keh
 
mahl
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. how poorly
¡Qué mal se está educando a los niños!How poorly children are being taught!
a. how ill
¿Cómo que Ana se quedó en la cama? ¡Qué mal debe sentirse!What you mean Ana stayed in bed? How ill she must feel!
a. how bad
¡Qué mal me sentí cuando descubrí que me había mentido!How bad I felt when I discovered he'd lied to me.
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