"市势疲弱" can be translated into English as "the market is weak" or "market sentiment is sluggish".
"The market is weak" directly conveys the idea of a market that lacks strength or momentum.
"Market sentiment is sluggish" emphasizes the lack of enthusiasm or activity among market participants, which often leads to a weak market performance.
Both expressions capture the essence of "市势疲弱," which refers to a market condition characterized by low activity, weak prices, or a general lack of buying interest.