stiff upper lip (noun) determination: perseverance
Sinonime: assurance,
backbone*, boldness,
bravery,
certainty, certitude, constancy,
conviction,
courage, dauntlessness,
decision,
dedication, doggedness, dogmatism,
drive,
energy, fearlessness, firm-ness,
fortitude, grit,
guts*, hardihood,
heart*,
independence, indomitability, intrepidity,
nerve*, obstinacy,
persistence, pluck,
purpose, purposefulness, resoluteness,
resolution,
resolve, self-confidence, single-mindedness, spine,
spunk*, steadfastness, stiff upper lip, stubbornness,
tenacity,
valor, willpower
Antonime: disinterest,
doubt,
hesitation, irresolution, spinelessness, vacillation