This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Not stopping; continuous.

adj. continuous; continuing indefinitely without stopping

Not ceasing; not intermitting; continual.

adj. continuing forever or indefinitely

adj. uninterrupted in time and indefinitely long continuing

"In the upper region the Christian dead are gathered in unceasing song and prayer."

permanent    lasting    continuous    uninterrupted   

constant   

ceasing    decreasing    fleecing    greasing    increasing    leasing    piecing    policing    releasing    subleasing   

ceaseless    incessant    unremitting    unending    fruitless    endless    never-ceasing    monotonous    unrelenting    inward