To depart clandestinely (suddenly or secretly); To steal off and hide

Ex: I absconded from Eric's wedding.

Deviating from the norm.  Noun form is aberration.

Ex: A bear deviates from the norm of an ant.

Eager and enthusiastic willingness.

Ex: I have alacrity in my academic pursuits.

Deviation from the normal order, form or rule; abnormality (adjective form is anomalous)

An expression of approval or praise.

Ex: You must give approval and praise to people who are on probation.

Strenuous, taxing; Requiring significant effort.

Ex: The climb up the mountain was long and arduous.

To ease or lesson; to appease or pacify.

Ex: Please appease or pacify me by easing or lessoning this pain in my ass.  Ex: You can assuage pain.