Meekly obedient or passive.

(BDSM) One who submits to a dominant partner in BDSM practices. / (rare) One who submits.

In a submissive manner.

The state or quality of being submissive.

plural of submissive

The act of submitting or yielding; surrender. / The act of submitting or giving e.g. a completed piece of work. / The thing which has been submitted.

A subset or component of a mission.

plural of submission

(obsolete) Submissive.

(obsolete) submissiveness