incessant

形容词 incessant:

1. occurring so frequently as to seem ceaseless or uninterrupted
   同义词：perpetual, endless
2. uninterrupted in time and indefinitely long continuing
   同义词：ceaseless, constant, never-ending, perpetual, unceasing, unremitting

1. Incessant background music makes me punch-drunk after a couple of hours.
   接连听了几个小时的背景音乐，使我觉得昏昏沉沉。
2. That incessant background music gets on my nerves.
   那没完没了的背景音乐令我非常烦恼！
3. The jukebox ground out an incessant stream of pop music.
   自动电唱机没完没了地放送流行乐曲。
4. We are tired of his incessant complaining.
   我们对他没完没了的埋怨感到厌烦。

in.ces.sant

adj.（形容词）
Continuing without interruption.See Synonyms at continual
连续不断的参见 continual

来源：
Middle English incessaunte
中古英语 incessaunte
from Late Latin incess3ns incessant-
源自 后期拉丁语 incess3ns incessant-
Latin in- [not] * see in-
拉丁语 in- [不] *参见 in-
Latin cess3ns [present participle of] cess3re [to stop] * see cease
拉丁语 cess3ns [] cess3re的现在分词 [停止] *参见 cease

【引伸】
inces.sancy
n.（名词）
inces.santly
adv.（副词）