qualm

blistering, breakneck, breathless, brisk, fast, fleet, fleet-footed, flying, galloping, hasty, hot, lightning, nippy, quick, rapid, rapid-fire, rattling, snappy, speedy, splitting, swift, whirlwind, zippy

expeditious, prompt, ready

accelerated, hastened, hurried, quickened, rushed

energetic, strenuous, strong, vigorous

ultrafast, ultrarapid

at speed [chiefly British]

crawling, dallying, dawdling, dillydallying, dragging, laggard, languid, lingering, plodding, poking, poky (or pokey), slowish, sluggish, unhurried

deliberate, leisurely, measured

dilatory, late, tardy

birdbrained, ditzy (or ditsy), featherbrained, flighty, frivolous, frothy, futile, giddy, goofy, harebrained, light-headed, light-minded, puerile, scatterbrained, scatty [chiefly British informal], silly, yeasty

fatuous, foolish, inane, nonsensical, thoughtless, witless

crazy, daffy, daft, fruity

exuberant, flippant, fluttery, giggly, happy, light, lighthearted, playful

sappy, shallow, superficial

grave, melancholy, somber (or sombre), thoughtful

dignified, heavy, no-nonsense, sedate, severe, solemn, staid

blistering, breakneck, breathless, brisk, fast, fleet, fleet-footed, flying, galloping, hasty, hot, lightning, nippy, quick, rapid, rapid-fire, rattling, snappy, speedy, splitting, swift, whirlwind, zippy

expeditious, prompt, ready

accelerated, hastened, hurried, quickened, rushed

energetic, strenuous, strong, vigorous

ultrafast, ultrarapid

at speed [chiefly British]

crawling, dallying, dawdling, dillydallying, dragging, laggard, languid, lingering, plodding, poking, poky (or pokey), slowish, sluggish, unhurried

deliberate, leisurely, measured

dilatory, late, tardy

birdbrained, ditzy (or ditsy), featherbrained, flighty, frivolous, frothy, futile, giddy, goofy, harebrained, light-headed, light-minded, puerile, scatterbrained, scatty [chiefly British informal], silly, yeasty

fatuous, foolish, inane, nonsensical, thoughtless, witless

crazy, daffy, daft, fruity

exuberant, flippant, fluttery, giggly, happy, light, lighthearted, playful

sappy, shallow, superficial

grave, melancholy, somber (or sombre), thoughtful

dignified, heavy, no-nonsense, sedate, severe, solemn, staid

blistering, breakneck, breathless, brisk, fast, fleet, fleet-footed, flying, galloping, hasty, hot, lightning, nippy, quick, rapid, rapid-fire, rattling, snappy, speedy, splitting, swift, whirlwind, zippy

expeditious, prompt, ready

accelerated, hastened, hurried, quickened, rushed

energetic, strenuous, strong, vigorous

ultrafast, ultrarapid

at speed [chiefly British]

crawling, dallying, dawdling, dillydallying, dragging, laggard, languid, lingering, plodding, poking, poky (or pokey), slowish, sluggish, unhurried

deliberate, leisurely, measured

dilatory, late, tardy

birdbrained, ditzy (or ditsy), featherbrained, flighty, frivolous, frothy, futile, giddy, goofy, harebrained, light-headed, light-minded, puerile, scatterbrained, scatty [chiefly British informal], silly, yeasty

fatuous, foolish, inane, nonsensical, thoughtless, witless

crazy, daffy, daft, fruity

exuberant, flippant, fluttery, giggly, happy, light, lighthearted, playful

sappy, shallow, superficial

grave, melancholy, somber (or sombre), thoughtful

dignified, heavy, no-nonsense, sedate, severe, solemn, staid

blistering, breakneck, breathless, brisk, fast, fleet, fleet-footed, flying, galloping, hasty, hot, lightning, nippy, quick, rapid, rapid-fire, rattling, snappy, speedy, splitting, swift, whirlwind, zippy

expeditious, prompt, ready

accelerated, hastened, hurried, quickened, rushed

energetic, strenuous, strong, vigorous

ultrafast, ultrarapid

at speed [chiefly British]

crawling, dallying, dawdling, dillydallying, dragging, laggard, languid, lingering, plodding, poking, poky (or pokey), slowish, sluggish, unhurried

deliberate, leisurely, measured

dilatory, late, tardy

birdbrained, ditzy (or ditsy), featherbrained, flighty, frivolous, frothy, futile, giddy, goofy, harebrained, light-headed, light-minded, puerile, scatterbrained, scatty [chiefly British informal], silly, yeasty

fatuous, foolish, inane, nonsensical, thoughtless, witless

crazy, daffy, daft, fruity

exuberant, flippant, fluttery, giggly, happy, light, lighthearted, playful

sappy, shallow, superficial

grave, melancholy, somber (or sombre), thoughtful

dignified, heavy, no-nonsense, sedate, severe, solemn, staid

blistering, breakneck, breathless, brisk, fast, fleet, fleet-footed, flying, galloping, hasty, hot, lightning, nippy, quick, rapid, rapid-fire, rattling, snappy, speedy, splitting, swift, whirlwind, zippy

expeditious, prompt, ready

accelerated, hastened, hurried, quickened, rushed

energetic, strenuous, strong, vigorous

ultrafast, ultrarapid

at speed [chiefly British]

crawling, dallying, dawdling, dillydallying, dragging, laggard, languid, lingering, plodding, poking, poky (or pokey), slowish, sluggish, unhurried

deliberate, leisurely, measured

dilatory, late, tardy

birdbrained, ditzy (or ditsy), featherbrained, flighty, frivolous, frothy, futile, giddy, goofy, harebrained, light-headed, light-minded, puerile, scatterbrained, scatty [chiefly British informal], silly, yeasty

fatuous, foolish, inane, nonsensical, thoughtless, witless

crazy, daffy, daft, fruity

exuberant, flippant, fluttery, giggly, happy, light, lighthearted, playful

sappy, shallow, superficial

grave, melancholy, somber (or sombre), thoughtful

dignified, heavy, no-nonsense, sedate, severe, solemn, staid