All-encompassing , ample, across the board, and all-embracing are synonyms for extensive; small and limited are antonyms of extensive. On this page, you will find 42 another word for extensive.
1. large
2. comprehensive
The research required extensive preparation, analysis, and documentation.
His knowledge on history is extensive, detailed, and impressive.
The extensive damage caused widespread chaos, panic, and confusion.
She has extensive experience in management, leadership, and strategy.