relentless ·adjective
Definition: never stopping or getting any less extreme Level: C2
经理对团队无休止的批评最终导致了士气低落。
The manager's ___relentless criticism of the team eventually led to low morale.
科学家们警告气候变化的无情推进及其后果。
Scientists warn of the ___relentless advance of climate change and its consequences.
他们的成功建立在竞争激烈的市场中，对创新的不懈追求之上。
Their success is built on a ___relentless pursuit of innovation in a competitive market.