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

strong and determined; a loyal supporter

strong, valiant

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

(of rules) strict, severe; that must be obeyed

rigid, tight

not prepared to make any compromise

stubborn

not becoming less in force, degree

merciless