твёрдый

1) General subject: adamant, adamantine (как алмаз), backboned, cast iron, compact, consistent, constant, coriaceous, crisp, crusty, deep seated, determined, eternal, fast, firm, fixed, flat, flinty, good, granitic, granitical, hard, hard and fast, hard core, hard-core, hardened, iron, iron bound, ironclad, manful, osseous, resolute, resolved, rigid, rocky, set, solid (не жидкий, не газообразный), sound, stable, stanch, staunch, steadfast, steady, stony, strong (приверженец, сторонник и т. п.), sturdy, sure, toughish, uncomplying, unfaltering, unflinching, unshaken, unshrinking, unwavering, unyielding, vertebrate, (долж fixed salary (A salary that is set at a dollar amount, and does not increase or decrease as a result of certain events occurring or not occurring, such as a level of business being done by the employer.), stiff, harsh, stubborn

2) Geology: calculous, cledgy, concrete, petrous, substantial

3) Biology: karroo (о почве)

4) Naval: tight

5) Medicine: scirrhous, sclerotic, solid-state

6) American: gritty, hard-boiled

7) Literal: marble

8) Botanical term: hard (лат. durus)

9) Engineering: particulate (о частицах в воздухе)

10) Chemistry: tallow

11) Construction: dura

12) Commerce: undepressed

13) Linguistics: (согласный) hard (consonant)

14) Architecture: four-square

15) Diplomatic term: stern, unequivocal

16) Forestry: buff

17) Oil: file-hard

18) Cartography: flinty (характеристика грунтов на морских картах), hard (характеристика грунтов на морских картах)

19) Business: undepressed (о состоянии рынка), upset

20) Drilling: tough

21) Automation: hard-grade (о шлифовальном круге)

22) Cables: hard (не мягкий), solid (не жидкий)

23) Makarov: deep-seated, iron-bound, karoo, karroo, rugged, secure, settled, stiff in the back (о человеке), stiffened (о жире), substantial (напр., о породе), upstanding

24) Combustion gas turbines: solid (не жидкий, не газообразный)