Another word for tough

tough
modif.
Strong
Cohesive
solid, firm, sturdy, hard, hardened, adhesive, leathery, coherent, inseparable, molded, tight, cemented, unbreakable, in one piece, dense, closely packed.
Difficult to chew
uncooked, half-cooked, gristly, sinewy, indigestible, inedible, fibrous, old, tough as shoe-leather*; see also raw 1.
Difficult
unyielding, hard, resisting, troublesome, onerous, intricate, puzzling, laborious; see also difficult 1, severe 1.
Hardy
*Rough and cruel
savage, fierce, desperate, ferocious, ruffianly, uproarious, terrible, rapacious, riotous, uncontrollable, unmanageable.
*Unfavorable
bad, unfortunate, untimely; see unfavorable 2.
*Excellent
fine, first-class, premium; see excellent.
Another word for tough

Physically toughened so as to have great endurance:
hard, hard-bitten, hard-handed, hardy, rugged. Idiom: hard as nails. See continue, strongCapable of exerting considerable effort or of withstanding considerable stress or hardship:
hardy, stalwart, stout, strong, sturdy. See strongRequiring great or extreme bodily, mental, or spiritual strength:
arduous, backbreaking, burdensome, demanding, difficult, effortful, exacting, exigent, formidable, hard, heavy, laborious, onerous, oppressive, rigorous, rough, severe, taxing, trying, weighty. See heavyNot easy to do, achieve, or master:
arduous, difficult, hard, laborious, serious, tall, uphill. See easyMarked by vigorous physical exertion:
knockabout, rough, rough-and-tumble, rugged, strenuous. See actionRigorous and unsparing in treating others:
demanding, exacting, hard, harsh, rigid, severe, stern, strict, unyielding. See easyIndicating or possessing determination, resolution, or persistence:
constant, determined, firm1, resolute, steadfast, steady, stiff, unbending, uncompromising, unflinching, unwavering, unyielding. See purpose
A rough, violent person who engages in destructive actions:
hoodlum, mug, roughneck, rowdy, ruffian. (Informal) toughie. (Slang) hood, punk. See attack, crimesA person who treats others violently and roughly, especially for hire:
hoodlum, ruffian, thug. (Informal) hooligan. (Slang) goon, gorilla, hood. See attack, crimes