Prelusive and Undeviating

Prelusive adjective - Coming before the main part or item usually to introduce or prepare for what follows.

Undeviating and prelusive are semantically related. In some cases you can use "Undeviating" instead an adjective "Prelusive".

Undeviating adjective - Not varying.

Prelusive and undeviating are semantically related. Sometimes you can use "Prelusive" instead an adjective "Undeviating".