to be weary of; to be fed up with; to be bored with

feeling weary or exhausted as a result of physical or mental exertion, or a lack of sleep

listless or weary; lacking enthusiasm or motivation

working with tireless persistence and continuous concentrated effort, especially in study or work

feeling sleepy, weary, or exhausted

a weary look on one's face

Instructing with tireless zeal (idiom, from Analects).

exhausted or worn out from labor or exertion

a weary or exhausted appearance shown on one's face.

feeling tired and sleepy; physically or mentally exhausted

to look tired

showing sustained enthusiasm or energy without becoming tired

to work or act with persistent effort and without becoming weary

study tirelessly, teach with endless enthusiasm (idiom, from the Analects)

professional burnout syndrome

tireless, untiring, or indefatigable