SLEEPIEST

SLEEPY

sleepy, sleepy-eyed, sleepyheaded

(adjective) ready to fall asleep; “beginning to feel sleepy”; “a sleepy-eyed child with drooping eyelids”; “sleepyheaded students”

Source: WordNet® 3.1

Adjective

sleepiest

superlative form of sleepy: most sleepy

Source: Wiktionary

SLEEPY

Sleep"y, a. [Compar. Sleepier; superl. Sleepiest.] Etym: [AS. sl. See Sleep, n.]

1. Drowsy; inclined to, or overcome by, sleep. Shak. She waked her sleepy crew. Dryden.

2. Tending to induce sleep; soporiferous; somniferous; as, a sleepy drink or potion. Chaucer.

3. Dull; lazy; heavy; sluggish. Shak. 'Tis not sleepy business; But must be looked to speedily and strongly. Shak.

4. Characterized by an absence of watchfulness; as, sleepy security. Sleepy duck (Zoöl.), the ruddy duck.

Source: Webster’s Unabridged Dictionary 1913 Edition