aggressive, antagonistic, argumental, argumentative, arrested, battling, bellicose, belligerent, bloodthirsty, bloody, bloody-minded, brawling, broken, broken off, callow, capricious, careening, cat-and-dog, cat-and-doggish, catchy, chauvinist, chauvinistic, chopped-off, choppy, combative, contentious, controversial, decousu, defective, deficient, desultory, deviative, disconnected, discontinued, discontinuous, discrete, disjunctive, disputatious, eccentric, embryonic, enemy, episodic, erratic, failing, ferocious, fierce, fighting, fitful, flickering, fluctuating, full of fight, guttering, halting, hawkish, herky-jerky, heteroclite, hostile, hypoplastic, immature, immethodical, in arrear, in arrears, in default, in short supply, inadequate, incoherent, incomplete, inconstant, infant, inimical, intermittent, intermitting, interrupted, irregular, jagged, jerky, jingo, jingoish, jingoist, jingoistic, lacking, litigious, lurching, martial, militant, militaristic, military, missing, needing, noncontinuous, nonlinear, nonsequential, nonserial, nonuniform, offensive, parenthetic, part, partial, patchy, polemic, pugnacious, quarrelsome, rambling, rough, saber-rattling, sanguinary, sanguineous, savage, scant, scanty, short, shy, sketchy, snatchy, soldierlike, soldierly, spasmatic, spasmic, spasmodic, spastic, sporadic, spotty, staggering, suspended, trigger-happy, truculent, uncertain, unconnected, underdeveloped, undeveloped, unequal, uneven, unfriendly, unjoined, unmethodical, unmetrical, unpacific, unpeaceable, unpeaceful, unregular, unrhythmical, unsettled, unsteady, unsuccessive, unsystematic, variable, veering, wandering, wanting, warlike, warmongering, warring, wavering, wobbling, wobbly

For further exploring for "scrappy" in Webster Dictionary Online