" transitoriness "

1: the state or quality of lasting only for a short time;

  * e.g., " ... given the transitoriness of inspiration, artists are inclined to work quickly whenever a new idea strikes "

•  Synonyms : 

•  ephemerality,

•  evanescence,

•  fleetingness,

•  fugitiveness,

•  impermanence,

•  impermanency,

•  momentariness,

•  temporariness,

•  transience,

•  transiency

•  Antonyms : 

•  endurance,

•  permanence,

•  permanency

1: lasting only for a short time;

  * e.g., " ... a transitory panic struck me when I realized that I had left my wallet in the car "

•  Synonyms : 

•  brief,

•  deciduous,

•  ephemeral,

•  evanescent,

•  flash,

•  fleeting,

•  fugacious,

•  fugitive,

•  impermanent,

•  momentary,

•  passing,

•  short-lived,

•  temporary,

•  transient

•  Antonyms : 

•  ceaseless,

•  dateless,

•  deathless,

•  endless,

•  enduring,

•  eternal,

•  everlasting,

•  immortal,

•  lasting,

•  long-lived,

•  permanent,

•  perpetual,

•  timeless,

•  undying,

•  unending