English Translation
Are you free tomorrow evening?
I saw somewhere that asking ひま was actually rude and there where far better ways to do so.
@Phat_Albert
暇 (ひま) is not rude at all in the context of someone’s free time.
(casual) 明日は夜、暇？
(casual) 明日の夜は暇ある？
(slightly casual) 明日の晩は時間ある？
(slightly casual) 明日の晩は時間とれる？
(formal & polite)明日の晩はお時間ございますか？
All of these phrases are interchangeable with the original sentence 明日の晩は、暇？
I think it’s better to replace 晩 with 夜 when it’s followed by 暇？, which is for casual questions.
Here are some other expressions with 暇 in a neutral way:
(slightly formal) 私は暇を見つけてはClozemasterで日本語を学んでいます。= Every time I find spare time, I play with Clozemaster to improve my Japanese skills.
(casual; friend-to-friend) 暇になったらご飯でも食べに行こうね！ = Let’s go out for dinner when you (or I) have more free time!
If you throw someone a question like this:
あんた、暇人？ (pron. ひまじん)
it sounds rude, meaning “you have so much free time that you obsessively stick your nose in every tedious matter (or that you come up with such a stupid idea.) You need to back off, moron!”
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Thank you for reply, wanted to make sure that if I put my foot in my mouth that it will be mostly intentional 
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