无奈的英文是cannot help but或resign oneself to (doing sth)。
短语搭配：无奈地说say resignedly、万般无奈have no alternative whatsoever (but to)。
双语例句：
1、我本应帮你，无奈当时手头很紧。
I would have helped you, but I was short of money at the time.
2、他不以为然地/无奈地耸了耸肩。
He gave a shrug of disbelief/helplessness.
3、今天本想回去，无奈没买着票。
I had planned to go home today, but I wasn’t able to get a ticket.
4、他整天游手好闲，他母亲对他无奈何。
He just fools around all day long, and his mother can do nothing about it.
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