Breakdown of C'est un petit malentendu, rien de grave.
petit
small / short
de
of / from / any (in negative sentences) / about (concerning)
grave
serious
c'est
it is, that is
Questions & Answers about C'est un petit malentendu, rien de grave.
Why is there a de between rien and grave?
Does malentendu literally mean "badly heard"?
Exactly! It is made up of mal (badly) and entendu (the past participle of entendre, to hear). Over time, this combination became a noun meaning a "misunderstanding".
Why do we use C'est here instead of Il est?