Senses
没关系/ 沒關係 it doesn't matter
it is not important; it is okay; there is no harm or difficulty
没关系/ 沒關係 not at all
polite formula used to respond to apologies or thanks, similar to "no problem" or "you're welcome"
没关系/ 沒關係 to have no relation
To have no connection with something; to be unrelated or irrelevant to a matter.