Classical vs. Classy: What's the Difference?

Classical and Classy Definitions
Classical
Of or relating to the ancient Greeks and Romans, especially their art, architecture, and literature.
Classy
Highly stylish; elegant.
Classical
Conforming to the artistic and literary models of ancient Greece and Rome.
Classy
Elegant, highly stylish or fashionable.
That's a very classy outfit you're wearing.
Classical
Versed in the classics
A classical scholar.
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Classy
Of a superior type; especially, exhibiting admirable personal qualities.
That was a classy response.
Classical
Of or relating to European music during the latter half of the 18th and the early 19th centuries.
Classy
Having elegance or taste or refinement in manners or dress. Opposite of styleless.
Classical
Of or relating to music in the educated European tradition, such as symphony and opera, as opposed to popular or folk music.
Classy
Exhibiting refinement and high character. Opposite of low-class
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Classical
Of, relating to, or being a variety of a language that is epitomized by a prestigious body of literature.
Classy
Elegant and fashionable;
Classy clothes
A classy dame
A posh restaurant
A swish pastry shop on the Rue du Bac
Classical
Standard and traditional
Classical methods of navigation.
Classical
Relating to or being a school of thought or field of study that is established and widely accepted before others
Classical economics.
Classical
Of or relating to physics that can be described without the use of quantum mechanics or relativity.
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Classical
Relating to or consisting of studies in the humanities and general sciences
A classical curriculum.
Classical
Of or relating to the first class or rank, especially in literature or art.
Classical
Of or pertaining to established principles in a discipline.
Classical
(music) Describing Western music and musicians of the late 18th and early 19th centuries.
Classical
Describing art music (rather than pop, jazz, blues, etc), especially when played using instruments of the orchestra.
Classical
Of or pertaining to the ancient Greeks and Romans, especially to Greek or Roman authors of the highest rank, or of the period when their best literature was produced; of or pertaining to places inhabited by the ancient Greeks and Romans, or rendered famous by their deeds.
Classical
Knowledgeable or skilled in the classics; versed in the classics.
A classical scholar
Classical
Conforming to the best authority in literature and art; chaste; pure; refined
Classical dance.
Classical
(physics) Pertaining to models of physical laws that do not take quantum or relativistic effects into account; Newtonian or Maxwellian.
Classical
(countable) One that is classical in some way; for example, a classical economist.
Classical
(chess) classical chess
Classical
Of or characteristic of a form or system felt to be of first significance before modern times
Classical
Of recognized authority or excellence;
The definitive work on Greece
Classical methods of navigation