controversial, acrimonious, divisive, rancorous, thorny, touchy, fractious, testy, nettlesome, prickly, tense, heated, ticklish, problematic, vexing, bitter, unpopular, combative, complicated, knottiest, unresolved, protracted, stormy, trickiest, tumultuous, disputed, intractable, tempestuous, convoluted, troublesome, confrontational, dicey, contested, problematical, emotive, polarized, messy, tortuous, vitriolic, unsettled, incendiary, lengthy, volatile, costly, disputatious, stalemated, adversarial, deadlocked, arduous, weighty, hot potato, stickiest, germane, important, perplexing, eventful, momentous, crucial, unedifying, strident, tetchy, debatable, quarrelsome, difficult, irresolvable, arcane, murkier, conciliatory, confusing, rocky, stalled, fence mending, politicized, turbulent, outspoken, salient, lopsided, challenging, impassioned, embarrassing, painful, chaotic, amicable, troubling, unpalatable, cordial, intriguing, anticlimactic, unseemly, litigious, frustrating, antagonistic, complex, nastier, substantive, delicate, unsavory, bizarre, tedious, exasperating, ugly, hashed, debated, noncontroversial, tricky, uncontroversial, vexed, disputable

arguing, argument, combatively, contention, contestation, controversy, disceptation, disputation, hornet's nest, hornets' nest, scrappily, sea lawyer, tilt

aggressive, argumentative, battleful, bellicose, disputative