If you send a low fee it could get confirmed, assuming at some point the mempool is pretty much cleared.
You could technically send a transaction, that would state you are trying to double spend the bitcoins. So technically no you can't actually spend it without confirmations.
Yes it would be returned assuming you or someone else doesn't rebroadcast the transaction.
so like this:
Wallet A sends btc to Wallet B with 1 sat fee.
Wallet B sends wallet to C before fully confirmed.
Once declined, money goes back to wallet A?
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