clueless
//ˈkluːləs//
Adjective
cluelessCanonical form
more cluelessComparative
most cluelessSuperlative
1
Having no knowledge, understanding, or awareness about something; completely uninformed or ignorant.
He was completely clueless about what was happening around him.
2
Lacking common sense or the ability to understand obvious things; foolish or naive.
He was so clueless that he didn't realize everyone was laughing at him.