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QUICK ANSWER
"No entiendo" is a form of "no entiendo", a phrase which is often translated as "I don't understand". "Lo siento" is a phrase which is often translated as "I'm sorry". Learn more about the difference between "lo siento" and "no entiendo" below.
lo siento(
loh
syehn
-
toh
)A phrase is a group of words commonly used together (e.g., once upon a time).
a. I'm sorry
Me enteré del fallecimiento de tu padre. Lo siento.I heard about the death of your father. I'm sorry.
no entiendo(
noh
ehn
-
tyehn
-
doh
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
a. I don't understand
Perdón, no entiendo alemán. ¿Hablas español?I'm sorry, I don't understand German. Do you speak Spanish?