What is the opposite of free as in "free of charge" (when we speak about prices)?
We can add not for negation, but I am looking for a single word.
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A person, animal or thing that is not free could be any of the following:
bound/bonded, grounded, restricted, captive, enslaved, shackled, reserved, occupied, busy
- Are you free? No, I'm busy.
- Is this seat free? No, it is reserved.
- My people are still enslaved. We want to be free.
- Some are free, but some are still captive.
- I don't know when I'll be free to visit. I'm grounded indefinitely.
- Our Southern brothers are free to do what they want, while we Northerners are bound by archaic and stifling conventions.
I just reread your question and realized I wasted my time writing all these answers, since you are only interested in the commercial case. Anything that is not free is simply not free or for sale. If you want no more than a single word, however, a few options are:
billable and chargeable
Perhaps surprisingly, there isn't a common, general-purpose word in English to mean "that you have to pay for", "that incurs a fee".
Some options that are used depending on the circumstances:
Otherwise, it is common to use a phrase such as "admission charge applies", "subject to payment" etc.
If you're referring to a product, it's probably more common simply to use a phrase such as "which must be paid for".
The answers given thus far are great contributions since they raise the various ways that 'free' might be used and different antonyms for different situations.
I don't know that we've come up with a precise answer to the question. An example sentence would be really useful to show what you want the opposite of. Any word that can be used and interpreted in so many ways as free needs contextual background if we are to understand what you're asking for.
If I assume that you want to say the opposite of e.g. 'The popcorn is free of charge when you purchase a ticket', the opposite would be e.g. 'The popcorn comes at a cost', 'The popcorn isn't free', 'The popcorn cost $10', 'You have to pay for the popcorn' or, simply, 'The popcorn isn't free'. The statement, 'You can take your baby on the flight free of charge' would be in opposition to 'You have to pay to take your baby on a plane' or 'It's not free', or informally, 'You gotta pay for it'. To say something is not included (if, for example, popcorn weren't free of charge, even with ticket) one could say 'The popcorn is not included in the ticket price'.
I'm sorry that I haven't given you one particular word as you requested but I have given some examples by which you can effectively (and nicely) state that something is not free of charge without having to use a statement like 'The product is not free of charge'. There is nothing wrong with changing your choice of words slightly to convey the same sentiment. If we become too fixated on using a particular phrase it can detract from what we finally say. So rather than searching to find a perfect antonym, make use of all the other beautiful words we have which will get your point across.