It indeed is probably used a synonym of narcissistic and/or selfish. Solipsism carries a different connotation with it. Narcissism is usually associated with e

It indeed is probably used a synonym of narcissistic and/or selfish. Solipsism carries a different connotation with it. Narcissism is usually associated with ego and self love while implying someone is "solipsistic" doesn't necessarily imply an overblown ego, assuming they really mean "an adherent of the philosophy," which is probably very seldom the case.