rigid, hard, stiff, tough, unyielding

exchange of fire, knock, crackle, peal (of thunder), rattle; hard frost, frozen stiff, intense heat

heavy, difficult, hard to digest, indigestible, lazy, burdensome

hard labor, toil, effort, exertion

hard-working, laboring, pertaining to labor

difficult situation, poverty, dire straits

difficult situation, poverty, dire straits

difficult, hard, problematic, fraught with difficulties, tough, awkward

difficult, hard, problematic, fraught with difficulties, tough, awkward

firm, thick, strong, tough, rigid

hard-working, tough, industrious

sharp rise, steep slope; road through a mountain; difficulty, complication; tough, harsh, mean, low, vile, harmful

iron; (fig. strong)

intoxication/buzz from smoking hashish/pot or strong tobacco

long-lasting, steady, stable, strong, firm

powerful, strong, great

strong, energetic, vigorous, having the vigour of life, skillful, great, competent