1) The state of being without the enegry, patience, willingness, inclination, or preparation to do something.
2) To be in the the state of "not being arsed" about something
"I am completely lacking in the required ammounts of arcicity in order to perform this job you ask of me"
"John, where is last weeks homework?"
"I didn't do it, ok?"
"It seems to me class, John is lacking in the required arsicity to finish this course"