A person who has risen, climbed up, or has been promoted to a higher social class, especially through acquisition of wealth, privileges, or political authority but has not gained social acceptance by those within that new class.
Being a parvenu; also, like, having the characteristics of, or associated with a parvenu.
Someone who lacks confidence or courage, is weak, ineffectual, irresolute and wishy-washy.
To render wimpy.
To behave submissively.