vs 

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 "no entiendo" and "lo siento" below.
no entiendo(
noh
 
ehn
-
tyehn
-
doh
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. I don't understand
Perdón, no entiendo alemán. ¿Hablas español?I'm sorry, I don't understand German. Do you speak Spanish?
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lo siento(
loh
 
syehn
-
toh
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. I'm sorry
Rompí tu ordenador. Lo siento.I broke your computer. I'm sorry.
a. I'm sorry
Me enteré del fallecimiento de tu padre. Lo siento.I heard about the death of your father. I'm sorry.
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