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Looks like this discussion should be split off to the separate thread in "Grammar and vocabulary."
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Not necessary. Usually -ский is derived from noun while -ный usually is not so they are not always in couples. For example there is no -ский couple for красный. And there is no -ный couple for...

There is a fundamental difference between adjectives which ends with -ный and -еский. It's like aspect for verbs - in the same way complicated and inexact. But unlike verb aspect native speakers...