there are all polite ansers, but I note that عَفْوًاis more formal then the others, then معذرة then سامحني which is too friendly!And what is a polite answer
If I have understood you, you need expression like :معذرة نفسيif someone excuses himself?
It's laa yuhimmu لا يُهِمُّ which means it doesn't matter, or literally it doesn't interest [anyone]. It can also mean: it doesn't worry [anyone], for the stem هـ-م-م can mean "to be important", and "to cause worry".However I found meself in trouble analyzing لَﺎ يَهَمُّ , which should stand for "Don't worry!" , but looks like "He is not worryng." for me.
Maybe because you were looking for a verbلا علينا is another puzzle. I can't find it's stem in my dictionaries.
No You've obviously passed that phase, you only need to practice more on looking up words in the dictionary. I remember it was a whole long lesson in the third year of prepartory school; six years after our first grammar lessons.Do you still have time to explain me the basics?
Maybe because you were looking for a verb
لا علينا is literaly: nothing is on us.
علينا is the preposition على + the pronoun نا (indicating the plural نحن or "us").
When I say: لا عَلَيْكِ it means: no [blame] on you, or "don't worry".