Words Frumpish and Good-looking are semantically related or have opposite meaning

How are the words Frumpish and Good-looking related? Frumpish and Good-looking are antonymous, they have opposite meaning.

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FAIR Synonyms: 661 Similar and Opposite Words

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Formal Semantics

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1 Semantics. 2 The branch of linguistics that is concerned with how meaning is expressed in language is called semantics. - ppt download