(of a person, action) showing a serious wish to do something successfully

driven, persistent

level; regular, steady; (of amount, distances, values) equal; (of a number) that can be divided by two

flat, uniform

loyal and true

loyal, reliable

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

fixed, stubborn

true and faithful

faithful, dependable

very determined

determined, strong-willed

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; loyal

loyal, steady

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

having good reasons to believe something; free from doubt; proved; reliable; without a doubt

certain, definite

not hesitating

steadfast

not showing pity or sympathy

firm

not becoming less in force, degree

merciless

never wanting to stop

determined, persevering

with complete commitment, sympathy etc

enthusiastic, sincere