windless

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It will fly slowly, only at about 70kph in windless conditions.
它飞得很慢，在无风状态下速度大约为每小时70千米。
He also liked to take his sailboat out on the water on windless days, "just for the challenge.
同时他也喜欢在无风的日子驾着他的帆船出海，“只是为了挑战”。
To prepare for the power fluctuations endemic to renewable energy, we’ll need to inventory excess power to use during cloudy, windless afternoons and nights.
为预备可再生能源发电中出现的发电量波动，我们需要储备过剩的电能以保证多云、无风的午后和夜晚的用电。

It looked like a repeat of windless 2004, when Outrageous had dropped out on Tuesday night.
FORBES: Magazine Article
This discourages investors in the flexible, gas-powered generation needed to provide backup for windless, cloudy days.
ECONOMIST: Germany’s energy transformation
There was a graininess to the air, which had itself warmed and grown windless, as it always did before a storm.
NEWYORKER: Great Experiment