Synonyms of intensive

1 Syllable
hard, ter, deep, fast
2 Syllables
worder, thorough, in-depth, all-out, profound, slambang, slam-bang
3 Syllables
out-and-out, demanding, complete, thoroughgoing, severe, speeded-up, heightened, intense, radical
4 Syllables
concentrated, exhaustive, embracive, all-consuming
5 Syllables
comprehensive, accelerated