A wine that lacks depth can be described as flat, lean, or thin. A wine's finish is the impression of flavor you experience after you swallow. Finish is strongly affected by your sense of smell, triggered by the olfactory receptors near the back of your throat. When the first and most prominent flavors in a wine are simple fruits, and there's none of the complexity and range of flavors you find in a more complete or complex wine, you describe the way it tastes as forward fruit. The slow, beautiful dripping that occurs when wine is swirled in a glass and slides down the sides is described as legs.
Surface tension created along the glass' wall by alcohol and glycerin in the wine produces the legs.
A wine that looks and tastes rich, deep, and concentrated is often described as viscous. It's the opposite of a wine you might describe as steely or austere. Length is the amount of time a wine's flavors linger in your mouth after you swallow. Longer is better, as long as the finish is pleasant. The way a wine tastes and the impressions it makes while it is in your mouth are its palate.