4
strenuous
4
vehement(adjective, strong, intense, powerful, penetrating)
3
intensified(adjective, strong, powerful, penetrating)
3
absolute
3
acute(strong, powerful, penetrating)
3
clear(adjective, feature, characteristic, focus)
3
complete(adjective, big, careful, exhaustive)
3
fast-paced
3
forceful(adjective, strong, powerful, penetrating)
3
in-depth(adjective, exhaustive)
3
out-and-out(adjective, exhaustive)
2
accelerated(adjective, exhaustive)
2
all-embracing(complete, tough, full, thorough, comprehensive)
2
all-encompassing
2
arduous
2
close(strong, powerful, penetrating)
2
consummate
2
dedicated(adjective, feature, characteristic, focus)
2
demanding(adjective, exhaustive)
2
dogged(adjective, feature, characteristic, focus)
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APASmart Define. (2016). intensive thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/intensive/thesaurus/synonyms
ChicagoSmart Define. 2016. "intensive thesaurus" https://smartdefine.org/intensive/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, intensive thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/intensive/thesaurus/synonyms>.
MLASmart Define. "intensive thesaurus" 26 February 2016. Web. 21 September 2026. <https://smartdefine.org/intensive/thesaurus/synonyms>