Translation Japanese English: 強靭

1 arduous, austere, awkward, backbreaking, callous, difficult, dour, embarrassing, fibrous, forbidding, grim, grueling, gruelling, hard, hard-boiled, hardhearted, heartless, heavy, indurate, knockout, laborious, operose, pachydermatous, punishing, rocky, rough, severe, sinewy, stern, sticky, stiff, stifling, stringy, sulfurous, sulphurous, sultry, toilsome, tough, toughened, unchewable, unenviable, unyielding.

2 arduous, backbreaking, baffling, elusive, grueling, gruelling, hard, heavy, intemperate, knotty, laborious, operose, problematic, problematical, punishing, toilsome, tough, toughened.

3 bad, baffling, elusive, hard, knotty, problematic, problematical, ruffianly, rugged, sturdy, tough, toughened.

4 bad, big, firm, hard, harsh, impregnable, intense, inviolable, mighty, potent, powerful, resistant, robust, secure, solid, steadfast, steady, stiff, strong, substantial, tolerant, tough, toughened, unassailable, unattackable, unbendable, unfaltering, unshakable, unwavering.

5 baffling, elusive, firm, knotty, problematic, problematical, tough, toughened.

6 buckram, contrary, dependable, fast, firm, formal, good, hard, honest, impregnable, inviolable, loyal, obstinate, perverse, reliable, rigid, safe, secure, solid, starchy, steadfast, steady, stiff, strong, tight, tough, toughened, true, truehearted, unassailable, unattackable, unbendable, unfaltering, unshakable, unwavering, wayward.

7 buckram, contrary, dependable, fast, firm, good, hard, honest, impregnable, inviolable, loyal, obstinate, perverse, reliable, rigid, safe, secure, solid, starchy, steadfast, steady, stiff, strong, stubborn, sure, tough, toughened, true, truehearted, unassailable, unattackable, unbendable, unfaltering, unregenerate, unshakable, unwavering, wayward.

8 firm, fixed, hard, rigid, set, solid, tough, toughened.

9 firm, hardy, impregnable, inviolable, secure, solid, stalwart, stout, strong, sturdy, tough, toughened, unassailable, unattackable.

10 hard, rough, sturdy, tough, toughened, unsmooth.

11 hardened, tempered, tough, toughened, treated.

12 hardy, impregnable, inviolable, obstinate, robust, secure, stalwart, stout, strong, stubborn, sturdy, tough, toughened, unassailable, unattackable, unregenerate.

13 resolute, tough, toughened.