noun

1. An extremely long time.

   “I haven't seen him in forever!”

2. A mythical time in the infinite future that will never come.

   “Sure, I'd be happy to meet with you on the 12th of forever.”

adjective

1. Permanent, lasting

adverb

1. (duration) For all time, for all eternity; for a lifetime; for an infinite amount of time.

   “I shall love you forever.”

2. (duration) For a very long time, a seeming eternity.

   “We had to wait forever to get inside.”

3. (frequency) Constantly or frequently.

   “You are forever nagging me.”

Synonyms: always, continually, eternally, evermore, for ever more, for good, forever and a day, forevermore