peace·able /'pē-sə-bəl/ adj: marked by freedom from dispute, strife, violence, or disorder
the right to peaceable assembly
peace·ably /-blē/ adv

Merriam-Webster’s Dictionary of Law. . 1996.

I adjective agreeable, amiable, amicable, bloodless, calm, composed, contented, disposed to peace, easygoing, equable, forgiving, free from war, friendly, gentle, good-tempered, halcyon, halcyonian, imperturbable, inoffensive, kindly, lamblike, mild, moderate, neutral, noncombative, orderly, pacific, pacificatory, pacifistic, patient, peace-loving, peaceful, peacelike, placabilis, placid, placidus, quiescent, quiet, reasonable, restrained, satisfied, sedate, serene, slow to take offense, sober, still, tame, temperate, tolerant, tranquil, unagitated, unanxious, unbellicose, unbelligerent, uncontentious, undisturbed, unexcitable, unexcited, unmilitant, unmoved, unpugnacious, unresisting, unruffled, untroubled, welldisposed II index neutral, nonmilitant, patient, placid

Burton's Legal Thesaurus. . 2006

Peaceful; free from arguments, conflict, or violence.

The Essential Law Dictionary. — Sphinx Publishing, An imprint of Sourcebooks, Inc. . 2008.