refusing to give in

unyielding

that cannot be moved; not able, refusing to be affected or changed

fixed, stubborn

stubborn

pig-headed, stubborn

often expressing (too much) confidence in one's own opinion

believing very strongly and conveying it

not expected to change; going on for a long time; intended to last

constant, lasting

(of concrete) in blocks ready for use in building

hardened

stiff; that cannot be bent; firm; strict; not changing

stiff, strict, severe

decided and fixed; (of opinions, habits etc) fixed and not to be changed; unmoving; a group of games (in tennis etc); a group of similar things; the position (of the body, clothes etc)

decided

firm; not likely to move or change; a building in which horses are kept and fed; a number of horses (especially racehorses) belonging to one particular owner

constant, fixed; resistant

firmly fixed or supported; not likely to fall over; not changing in amount, speed etc; (of a person behaviour) having, keeping to, a regular (good) pattern

stable, fixed

not prepared to make any compromise

stubborn