soonest [su:nɪst]

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附加级

adj.不久( soon的最高级 )；即刻；早；快

I can't come until tomorrow, at the soonest. 我最快也要到明天才能来。来自《简明英汉词典》
The least said, the soonest mended. （谚语）多说反而坏事。来自《用法词典》