flightiest

Least reliably grounded

Flightiest is the superlative form of flighty—the most prone to sudden changes of mind or mood, the least stable or reliable.

Someone described as the flightiest person in a group is the most impulsive, scatterbrained, or emotionally unpredictable: She was the flightiest of the three sisters, always chasing some new obsession.

frivolous

whimsical

Playfully fanciful or erratic

capriciousSubject to sudden changes
giddyDizzy or excitedly silly
scatterbrainedLacking mental focus

ditzy · airheaded · flaky · mercurial · impulsive · fickle · silly · lightheaded · thoughtless · irresponsible

imaginative

fanciful

Imaginatively unrealistic

dreamyVague and pleasantly distracted
fantasticalExtravagantly unreal or imaginary
visionaryImaginative planner of futures

head-in-clouds · romantic · idealistic · ethereal · otherworldly · escapist · whimsical · impractical · unrealistic · daydreaming

nervous

jittery

Anxiously restless

restlessUnable to be still
skittishProne to nervous fright
jumpyNervously reactive to stimuli

anxious · twitchy · edgy · high-strung · excitable · agitated · fidgety · antsy · fluttery · startled

Opposites

stability and consistency

flightieststeadiest

Superlatively constant and reliable

seriousness/gravity

flightiestgravest

Most serious or critical

emotional stability

flightiestcalmest

Superlative of tranquil

Family

flightier

Familiarity: Top 500,000
Profile: Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G