busy as beaver (adjective) busy: active, on the go
Sinonime: assured,
composed, coolheaded,
deliberate,
detached,
dispassionate,
impassive, imperturbable, levelheaded,
nonchalant,
philosophical,
phlegmatic,
placid,
quiet,
relaxed, self-controlled, self-possessed,
serene,
stolid,
together,
tranquil, unagitated,
unemotional, unexcited, unflappable, unruffled
Antonime: agitated,
annoyed,
excited,
upset