unproductive
adjective uk/ˌʌn.prəˈdʌk.tɪv/ us/ˌʌn.prəˈdʌk.tɪv/
C1 收益很少的;效果不明显的
not producing very much
Opposite: productive
C1 徒然的；无效的
not having positive results
It was such an unproductive meeting - we didn't make a single decision. 这是场徒劳无功的会议——我们连一项决议也没有做出。