to not recognize or be unaware of; to ignore someone by pretending not to know them; Fail to treat someone in the way they deserve; not appreciate a quality, something they merit
little known, unfamiliar (previously encountered but not familiar or well-acquainted); unrecognized, unfamiliar, unidentified (previously encountered but not known by name or identity); misunderstood (which is correctly recognized or identified, but whose true nature, qualities, character, etc. are not); underappreciated, unrecognized (deserving or worthy of recognition that is not received); unsung, obscure (not famous but deserving to be)