submissive has 2 distinct synonyms spread across 1 of its 2 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is domineering.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
inclined or willing to submit to orders or wishes of others or showing such inclination
“submissive servants”
abjectly submissive; characteristic of a slave or servant
“slavish devotion to her job ruled her life”
Synonyms, antonyms and the broader and narrower relations for submissive come from Princeton University’s WordNet. Full sources and licences.