Some choices: sleepy, wasted, torpid
Lethargic, indolent
Lethargic is a word that means tired, lazy sluggish, so antonyms of lethargic would be energetic and active.
tired
Consumed is a synonym for tired. It begins with the letter c.
lifeless, sluggish
strayd
Sluggish or lagging would do
The word sluggish means:Displaying little movement or activity; slow; inactive: a sluggish stream; sluggish growth.Lacking alertness, vigor, or energy; inert or indolent.Slow to perform or respond to stimulation.
It is derived from the word 'Cansada' which means 'tired' in Spanish. It basically means 'a bit tired' or 'a little tired.'
tired
inactive
tired