Stilled, past participle of still. Synonyms in the same form.
Ease
eased, appeased, settled, quelled, soothed, pacified, allayed, alleviated, relieved, softened, assuaged, mitigated, composed
Silence
silenc'd, hushed, stifled, suppressed, muffled
Lull
lulled, quietened
All synonyms for still →