buckled down

decisive dogged purposeful resolute resolved serious single-minded steadfast strong-willed stubborn tenacious

bent decided firm fixed obstinate pat persevering set settled

bent on constant earnest hard as nails hardboiled intent mean business on ice set on solid strong-minded unfaltering unflinching unhesitating unwavering

irresolute undetermined weak yielding

changeable flexible indefinite soft undecided unfixed

hesitating vacillating wavering