suboptimal
🇺🇸
/ˌsʌbˈɑːptɪməl/
🇬🇧
/ˌsʌbˈɒptɪməl/
not as good as it could be
The suboptimal weather conditions made it difficult for the athletes to perform at their best.
不佳的天氣條件使得運動員很難發揮出最佳水平。