Learn how to say Cocooned correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word cocoon:
the silky or fibrous case which the larvae of certain insects spin about themselves for shelter during the pupa stage
any protective cover like this, as the egg capsule of certain spiders, leeches, etc.
any cover used to waterproof or protect something, esp. military equipment for transport or storage
to enclose protectively, as in a cocoon
to isolate (oneself)