幽香雨草
看你要在哪种语境下使用了。如果是会引起麻烦事儿而不便，那可以用inconvenient，如果是你不能抽空做某事，比如去约会，那就要用 not available. e.g, May I invite you to dinner tonight? Thank you, but I'm not available.
凌空抽筋
不方便 [词典] inconvenience; discommodiousness; [例句]你能10点半来吗？我知道你不方便，但是我必须见你。Can you come at 10.30? I know it's inconvenient for you, but I must see you
芥末生煎
地道的说法是 congestion 交通堵塞，或 congested.E.g., You should have seen how congested the highway was this morning.There is so much congestion during the morning hours, so I quit driving.答完了才意识到答非所问，不好意思。交通不便。 国外的交通不便主要是指缺少公共交通设施， lack of public transportation; 或堵塞。 你说的交通不便可能是有其他原因，不如你说 traveling inconveniences caused by lack of public transportation/ lack of city infrastructure [on roadways].
