After three failed bids, the sales team began to question the futility of chasing that client.

連續三次投標失敗後，業務團隊開始質疑追那位客戶是否只是徒勞。

The manager recognized the futility of rescheduling the meeting again and simply canceled it.

經理意識到再次改期會議毫無意義，乾脆直接取消了。

Customers expressed frustration at the futility of calling a support line that never answered.

顧客對撥打永遠沒人接的客服專線徒勞無功感到十分沮喪。