When I hear someone call a girl skinny, I assume they mean someone who is underweight and looks like they are at a weight that is unhealthy for them, for example like how Nicole Richie was a few years ago or Amy Whinehouse. However, it seems like most people use the word 'skinny' to describe girls who are slim and dont' have massive boobs or hips. I've heard people describe Jessica Alba, Eva Longoria, Kylie Minogue and Adriana Lima as 'skinny', which confuses me as even though they are not as curvy as say Kelly Brook, they certainly do not look underweight. So does skinny actually mean 'slim', or does it mean 'underweight'?