Table of Contents POS
HYPHEN
WORDNET DICTIONARY
CIDE DICTIONARY
THESAURUS

WORDNET DICTIONARY

Noun sleepiness has 1 sense

• sleepiness(n = noun.state) drowsiness, somnolence - a very sleepy state; "sleepiness causes many driving accidents"
is a kind of temporary state
has particulars: oscitance, oscitancy
Derived form adjective sleepy₁
Antonym: wakefulness

CIDE DICTIONARY

THESAURUS

sleepiness

acedia, apathy, boredom, brain fag, debilitation, debility, drowsiness, dullness, enervation, enfeeblement, ennui, eyestrain, faintness, fatigue, goneness, heart strain, heaviness, hebetude, inanimation, indifference, jadedness, lackadaisicalness, languidness, languishment, languor, languorousness, lassitude, lenitude, lentor, lethargy, lifelessness, listlessness, mental fatigue, mental strain, oscitancy, overstrain, overtiredness, passivity, phlegm, satedness, sloth, slothfulness, slowness, sluggishness, somnolence, stance fatigue, strain, stupefaction, stupor, supineness, tiredness, torpidity, torpidness, torpitude, torpor, weakness, wearifulness, weariness, world-weariness

For further exploring for "sleepiness" in Webster Dictionary Online