First-class and Primaeval

First-class adjective - Of the very best kind.

Primaeval and first-class are semantically related. In some cases you can use "Primaeval" instead an adjective phrase "First-class".

Primaeval adjective - Having existed from the beginning; in an earliest or original stage or state.

First-class and primaeval are semantically related. Sometimes you can use "First-class" instead an adjective "Primaeval".