Cứng rắn, sắt đá, không lay chuyển

Ngoan cố, cứng đầu cứng cổ, bướng bỉnh

adjective

adamant , bullhead , callous , cold fish * , dogged , firm , fixed , hanging tough , hard , hard-boiled * , hard-hearted , hard-nosed , harsh , heartless , immovable , implacable , indurate , inexorable , inflexible , iron * , mean , mulish * , obstinate , perverse , relentless , rigid , set in stone , stiff-necked * , thick-skinned * , tough , tough nut to crack , unbending , uncompassionate , uncompromising , uncooperative , unemotional , unfeeling , unimpressible , unrelenting , unshakable , unsympathetic , unyielding , cold-hearted , compassionless , hard-boiled , hardened , hardhearted , stonyhearted , adamantine , brassbound , die-hard , grim , incompliant , intransigent , iron , remorseless , unbendable , uncompliant , cruel , headstrong , impenitent , insensible , intractable , persistent , pigheaded , rough , rugged , stubborn

adjective

amenable , gentle , submissive , susceptible , yielding