Meaning of the word "drained"
drained
very tired
[adjective]
drained of electric charge; discharged
[adjective]
Examples:
left the lights on and came back to find the battery drained
emptied or exhausted of (as by drawing off e.g. water or other liquid)
[adjective]
Examples:
a drained marsh
a drained tank
a drained and apathetic old man...not caring any longer about anything