a manifestation of insincerity(noun.communication)
Example: He put on quite an act for her benefit.
source: wordnet30
That which is done or doing; the exercise of power, or the effect, of which power exerted is the cause; a performance; a deed.(noun)
source: webster1913
verb (v)
perform an action, or work out or perform (an action)(verb.social)
Example: Think before you act.
The governor should act on the new energy bill.
The nanny acted quickly by grabbing the toddler and covering him with a wet towel.