leadfoot (noun) driver: person who engineers vehicle
Sinonime: confident, cool,
easy,
easygoing, levelheaded,
nonchalant,
peaceful,
placid, poised,
possessed,
quiet,
sanguine, self-possessed,
serene,
still,
sure,
temperate,
together,
tranquil, unflappable, unperturbable, unperturbed, unruffled
Antonime: agitated,
disorganized,
excited, mixed up, upset, worried