Quelled, past participle of quell. Synonyms in the same form.
Appease
appeased, pacified, suppressed, alleviated, subdued, soothed, stifled, squelched, assuaged, allayed, repressed, quenched, quashed, mollified, stilled, reduced, mitigated, calmed, extinguished, vanquished
Other
crushed, killed
All synonyms for quell →