Final answer:
The missing word in the sentence from the play is 'dirty', which suggests the napkin is soiled and therefore undesirable to the character.
Step-by-step explanation:
The word that completes the sentence, "Your napkin is too ___ (He pushes the handkerchief away, and it falls)," from the play is 'dirty'. This is a line that indicates that the character finds the handkerchief unacceptable for use due to being soiled or unclean. In literature, a dirty napkin could symbolize various themes, such as disregard for proper etiquette, the character's disdain for their current situation, or a suggestion of disorder in the character's life or environment.