41 extensive synonyms include large, large-scale, sizeable, substantial, considerable, ample, great, huge, vast, and immense. Extensive is an adjective, and its antonyms are small and limited. Here are some additional synonyms for "extensive" with example sentences.
41 other ways to say extensive.
His knowledge on history is extensive, detailed, and impressive.
She has extensive experience in management, leadership, and strategy.
The research required extensive preparation, analysis, and documentation.