Step 1: Picture eccentricity as anything that breaks from the usual pattern of behavior.
Step 2: Anomaly is literally a departure from the normal, Queerness is plain oddness, and Foible is a minor personal quirk, all consistent with this picture.
Step 3: Sameness describes conformity and consistency, the exact reverse of being eccentric, so it stands apart from the rest.
\[\boxed{\text{Sameness}}\]