impresses up on (verb) hammer away/hammer into: work hard at
Sinonime: close,
constant,
determined,
firm,
fixed, for real,
grave,
intent, mean business,
meaningful, no-fooling, no-nonsense, playing hard ball,
resolute, resolved,
sedate, sincere,
sober,
solemn,
somber,
stable,
staid,
steady,
thoughtful, weighty
Antonime: flippant,
insincere,
thoughtless,
trivial,
unimportant, unserious