Forever vs. Endless

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

Example: ‘I shall love you forever.’;

For a very long time, a seeming eternity.

Example: ‘We had to wait forever to get inside.’;

(frequency) Constantly or frequently.

Example: ‘You are forever nagging me.’;

An extremely long time.

Example: ‘I haven't seen him in forever!’;

(colloquial) a mythical time in the infinite future that will never come.

Example: ‘Sure, I'd be happy to meet with you on the 12th of forever.’;

Permanent, lasting

Through eternity; through endless ages; eternally.

At all times; always.

for a limitless time;

Example: ‘no one can live forever’; ‘brightly beams our Father's mercy from his lighthouse evermore’;

seemingly without interruption; often and repeatedly;

Example: ‘always looking for faults’; ‘it is always raining’; ‘he is forever cracking jokes’; ‘they are forever arguing’;

for a very long or seemingly endless time;

Example: ‘she took forever to write the paper’; ‘we had to wait forever and a day’;

Having no end.

Example: ‘endless time; endless praise’;

Extending indefinitely.

Example: ‘an endless line’;

(obsolete) Without profitable end; fruitless; unsatisfying.

Without end; having no end or conclusion; perpetual; interminable; - applied to length, and to duration; as, an endless line; endless time; endless bliss; endless praise; endless clamor.

Infinite; excessive; unlimited.

Without profitable end; fruitless; unsatisfying.

Void of design; objectless; as, an endless pursuit.

having a linear or ribbonlike form with the two ends connected together, such as in a circle, ellipse, torus, or any other closed loop. Belts or chains used in drive mechanisms are considered endless in this sense. See endless chain.

tiresomely long; seemingly without end;

Example: ‘endless debates’; ‘an endless conversation’; ‘the wait seemed eternal’; ‘eternal quarreling’; ‘an interminable sermon’;

infinitely great in number;

Example: ‘endless waves’;

having no known beginning and presumably no end;

Example: ‘the dateless rise and fall of the tides’; ‘time is endless’; ‘sempiternal truth’;

having the ends united so as to form a continuous whole;

Example: ‘an endless chain’;

occurring so frequently as to seem ceaseless or uninterrupted;

Example: ‘a child's incessant questions’; ‘your perpetual (or continual) complaints’;