Synonyms of intensive in English:

intensive


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adjective

1‘an intensive course in Russian’

SYNONYMS
thorough, in-depth, concentrated, rigorous, exhaustive, all-out, concerted, thoroughgoing
all-embracing, all-encompassing, all-inclusive, comprehensive, complete, full, total, all-absorbing
serious, vigorous, strenuous, detailed, minute, close, meticulous, scrupulous, assiduous, conscientious, painstaking, methodical, careful, sedulous, elaborate, extensive, widespread, sweeping, searching, high-pressure, determined, resolute, persistent, insistent
ANTONYMS

superficial, cursory, partial