not know what to make of (someone or something)

not know what to make of (someone or something)

To not be sure of what one thinks about someone or something; to not have a clear or confident impression or understanding of someone or something. I came into the interview wearing a full clown costume with makeup, and I could tell they didn't know what to make of me at all. We're receiving a message from the alien spacecraft, but I don't know what to make of their language.
See also: know, make, not, of, what
Farlex Dictionary of Idioms.

not know what to make of someone or something

not to understand someone or something; not to be able to interpret something or the actions of someone. We really don't know what to make of his request.
See also: know, make, not, of, what
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • assumption
  • labor under (something)
  • labor under an assumption
  • hope not
  • (I) hope not
  • not (one's) long suit
  • not for a second
  • not for a minute
  • not for a moment
  • aint