incessant
Definitions
Continuing without pause or interruption; ceaseless.
Constantly recurring or persistent, often in an annoying or unpleasant way.
Examples
The incessant rain made it impossible to enjoy our picnic in the park.
She found it difficult to concentrate on her work due to the incessant chatter of her coworkers.
Synonyms
constant ceaseless perpetual continuous unremitting persistent endless
Antonyms
intermittent sporadic occasional infrequent periodic discontinuous temporary