Hard

Synonyms: Firm, dense, stiff, unbreakable, unpliable, unyielding, hardened, compacted, tough, stony, flinty, compressed, as hard as stone, adamantine, renitent, solid, rigid, resistant, inflexible, impenetrable, solidified, compact, steely, strong, rocklike, close-packed, as hard as iron, frozen, and unmalleable.

Synonyms: Forceful, strong, smart, powerful, mighty, tremendous, heavy, sharp, violent, vigorous, and hefty.

Synonyms: Arduous, tiring, exhausting, back-breaking, heavy, difficult, exacting, challenging, punishing, formidable, rigorous, Herculean, killing, knackering, exigent, perplexing, bewildering, knotty, ticklish, enigmatic, complex, involved, insoluble, impenetrable, unanswerable, mind-bending, insolvable, strenuous, fatiguing, wearying, gruelling, laborious, taxing, testing, demanding, tough, onerous, uphill, murderous, hellish, toilsome, puzzling, baffling, mystifying, thorny, problematic, complicated, intricate, tangled, unfathomable, incomprehensible, spiny, gnarly, and wildering.

Synonyms: Diligent, industrious, assiduous, energetic, enthusiastic, earnest, persistent, untiring, studious, hard-working, sedulous, conscientious, keen, zealous, persevering, unflagging, and indefatigable.

Synonyms: Harsh, difficult, bleak, tough, unpleasant, uncomfortable, unendurable, insupportable, spartan, severe, painful, grim, bad, dire, austere, disagreeable, intolerable, unbearable, straitened, dark, distressing, and awful.

Synonyms: Strict, firm, stern, rigorous, exacting, unfriendly, cold, hard-hearted, unfeeling, unbending, inflexible, implacable, obdurate, unrelenting, lacking compassion, ruthless, oppressive, pitiless, cruel, unjust, standing no nonsense, hard-boiled, solid, harsh, severe, tough, demanding, unkind, unsympathetic, heartless, cold-hearted, intransigent, uncompromising, intolerant, stubborn, unyielding, unsparing, grim, merciless, tyrannical, callous, vicious, unfair, ruling with a rod of iron, and badass.

Synonyms: Bitterly cold, bitter, severe, bleak, icy, arctic, Siberian, Baltic, cold, harsh, extreme, freezing, icy-cold, polar, and glacial.

Synonyms: Reliable, true, confirmed, indisputable, verifiable, cold, bold, unvarnished, definite, actual, undeniable, unquestionable, plain, bare, harsh, and unembellished.

Synonyms: Alcoholic, intoxicating, stiff, spirituous, intoxicant, strong, inebriating, potent, and vinous.

Synonyms: Addictive, causing dependency, harmful, habit-forming, strong, and narcotic.

Synonyms: Diligently, assiduously, sedulously, intensely, energetically, persistently, steadily, untiringly, with application, like mad, like billy-o, with effort, painfully, laboriously, industriously, conscientiously, busily, enthusiastically, earnestly, doggedly, indefatigably, all out, with perseverance, like crazy, with difficulty, after a struggle, and arduously.

Synonyms: Forcefully, fiercely, powerfully, strenuously, sharply, intensely, with all one's might, with vigour, with great effort, badly, acutely, keenly, profoundly, grievously, in torrents, cats and dogs, buckets, stair rods, forcibly, roughly, strongly, heavily, vigorously, energetically, with might and main, with force, severely, harshly, deeply, seriously, violently, gravely, in sheets, steadily, bucketloads, and pitchforks.