in·ces·sant 
(ĭn-sĕsənt)
(ĭn-sĕsənt)adj.
Continuing without interruption. See Synonyms at continual.
[Middle English incessaunte, from Late Latin incessāns, incessant- : Latin in-, not; see IN-1 + Latin cessāns, present participle of cessāre, to stop; see CEASE.]
in·cessan·cy n.
in·cessant·ly adv.