Is there a single word that is the opposite of "want" (i.e. "do not want")?

I might choose abhor,

abhor   verb

to regard with extreme repugnance or aversion; detest utterly; loathe; abominate.

Or, detest, loathe or despise

despise   verb

to regard with contempt, distaste, disgust, or disdain; scorn; loathe.

The term eschew means

to keep away from (something harmful or disliked); shun; avoid; abstain from

However, it seems a bit more active than the obverse of want.

Consider using dislike.

I dislike that broom.

I dislike sweeping the floor.

reject seems like the closest opposite but it depends on the context. There is no exact opposite of "want".

reject: to refuse to take something, for example because it is damaged or is not what you wanted

reject: to refuse to accept, acknowledge, use, believe, etc

I think it covers most of the senses of "not wanting".

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"disincline" would fit also (again, it is not an exact opposite). It covers different levels of unwillingness and it is both transitive and intransitive.

to make or be unwilling, reluctant, or averse

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Although, "diswant" would be a nice neologism.

There is also an interesting approach regarding to semantic primitives from the book "Semantics : Primes and Universals By Anna Wierzbicka":

Some of the responses are a bit too strong to be opposites of want. I voted for dislike, but I'll also suggest avoid.

1. To keep away from; to keep clear of; to endeavor not to meet; to shun; to abstain from.

In your examples "I avoid that object" and "I avoid doing that" seem to fit nicely as opposites to want.

Consider "exclude," "detest," and "execrate."

exclude: consider that something is not worth attention.

E.g.

In business and in life, we can get forward by doing things others exclude [=don't want] to do.

This is a rule that I vehemently exclude from my tournaments, as we've lost more than a few rounds due to this ridiculous rule.

detest: to abhor; dislike intensely.

Let the child -- say, a daughter -- be happy, let her be miserable, let her deeply desire this or deeply detest that.

execrate: to detest utterly.

What scope is there for the stronger emotions if the orator is not to his speech, to flame out in anger, to reproach, to wish or to execrate?

How about the verb 'to resent sth', 'to resent doing sth', 'to resent sb doing sth'?

Here is what the Longman Dictionary of Contemporary English says:

resent /ri'zent/ [transitive]

to feel angry or upset about a situation or about something that someone has done, especially because you think that it is not fair; resent (somebody) doing something; bitterly/deeply/strongly resent

I resented having to work such long hours.

She bitterly resented his mother's influence over him.

Paul resented the fact that Carol didn't trust him.

I resented having (= did not want to have) to work such long hours.

She bitterly resented (= did not at all want) his mother's influence over him.

Paul resented the fact that Carol didn't (= did not want Carol not to) trust him.

Of course you cannot resent something that does not exist, whereas you can 'not want' it.

I do not want a third world war. * I resent a third world war. *

but then, just adding the phrase 'the idea of' does the trick:

I do not want (= resent the idea of) a third world war.

It's a stretch.... BUT they are single-words

Repudiate and refuse

• I want + [noun] = I want prosperity

• I repudiate + [noun] = I repudiate prosperity

• I want to [verb] = I want to go

• I refuse to [verb] = I refuse to go

Let's not talk about what you want or repudiate, let's take action instead
Let's not talk about what you want to do or refuse to do, let's take action instead

I read a lot of the answers here, and many people suggested 'abhor' or 'reject.' These words don't really reverse 'want,' though, because they add so much negative emotion. 'Diswant' is a lovely word, I wish it was real.

"Do you want to go for a walk in the lovely sunshine instead of reading that silly old Jane Austen book?"

"No, I diswant to go for a walk, and I want to read." - what I want to say. "No, I abhor going for a walk, and I want to read." - too much vehemence about the walk "No, I reject your offer to walk, I want to read." - rejection of the person? how rude.

Everyone is taking the wrong approach to the question, " What is the opposite of 'want'"? The negative is not necessarily the opposite, i.e. want and not want. The opposite of want is "need". You're welcome