Modifiers matching departure:

• unplanned,
• special,
• permanent,
• involuntary,
• temporary,
• planned,

Simple categories matching involuntary:

• activity,
• control,
• movement,
• change,
• emotion,
• organs,
• measure,
• process,
• action,
• circumstance,
• function,
• cause,
• creditor,
• event,
• reflex,
• response,
• situation,
• act,
• thing,
• exchange,
• claim,
• force,
• association,
• tissue,
• termination,
• departure,
• vocalization,
• unemployment,
• muscle,
• motion,
• reaction,