not to be put down
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Roget 604:
resolved
etc.
v.;
determined;
strong-willed,
strong-minded;
resolute
etc.
(brave)
861;
self-possessed;
decided,
definitive,
peremptory,
tranchant†;
unhesitating,
unflinching,
unshrinking†;
firm,
iron,
gritty [U.S.],
indomitable,
game to the backbone;
inexorable,
relentless,
not to be shaken,
not to be put down;
tenax propositi [Lat.];
inflexible
etc.
(hard)
323;
obstinate
etc.
606;
steady
etc.
(persevering)
604.1.
earnest,
serious;
set upon,
bent upon,
intent upon.
steel against,
proof against;
in utrumque paratus [Lat.].
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