Synonyms of extensive in English:

extensive


See US English definition of extensive

See UK English definition of extensive

See Spanish definition of extenso

adjective

1‘a mansion with extensive grounds’

SYNONYMS
large, large-scale, sizeable, substantial, considerable, ample, great, huge, vast, immense, boundless, immeasurable
spacious, capacious, commodious, voluminous, roomy
broad, expansive, sweeping
ANTONYMS

small

2‘his extensive knowledge of antiques made the shop popular’

SYNONYMS
comprehensive, thorough, complete, exhaustive, profound, boundless
broad, wide, vast, wide-ranging, all-inclusive, all-embracing, all-encompassing, sweeping, wholesale, catholic, universal, across the board, cross-disciplinary, interdisciplinary, multidisciplinary
ANTONYMS

small, limited