never-ending

never-ending
ˌnever-ˈending adjective
seeming to continue for a very long time
   SYN  endless:
    Keeping the house neat and clean is a never-ending battle.
     

THESAURUS

   ▪ permanent continuing forever, for a very long time, or for the rest of your life: She has permanent damage to her eyesight. | the search for a permanent solution to the problem | They’ve offered her the job on a permanent basis.
   ▪ lasting continuing for a very long time – used especially when something continues to affect someone or something for a long time: The experience left a lasting impression on him. | Things that happen in early childhood can have a lasting effect on your life. | Shelley was to have a lasting influence on him. | Is there any hope for a lasting peace in the Middle East?
   ▪ never-ending continuing so long that you think it will never end – used especially when something needs a lot of effort: Keeping the house clean is a never-ending battle. | It was a never-ending task. | The search was never-ending.
   ▪ perpetual a perpetual state or feeling seems to be there all the time – used especially about something that is very annoying, worrying, or tiring: For many working mothers, balancing the demands of children and job is a perpetual challenge. | The people live in a perpetual state of fear.
   ▪ everlasting continuing forever – used especially in the following phrases: Gold is the symbol of everlasting love. | He promised them everlasting life.
   ▪ eternal continuing forever – used especially in the following phrases: Do you believe in eternal life? | the secret of eternal youth | She has my eternal gratitude (=I will always be grateful to her). | You’re always the eternal optimist. (=you always think that good things will happen)