What is an adjective to describe someone who is the opposite of reckless other than 'cautious' or 'careful'?
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The classical meaning of reckless is- not giving enough thought to your actions or decisions. It this case the opposite or adjective to describe someone who is the opposite of reckless would be prudent as in
"no prudent money manager would authorize a loan without first knowing its purpose"
There could very well be many more possible answers but they all depend on the context of usage of reckless.
I like the word measured, but it would apply more to a person's actions than their character. Context is necessary.
Akash Vartak gives a great general-purpose antonym for reckless, but there are better in some specific contexts. For example, in American English, in the context of driving a motor vehicle, safe is the most conventional antonym. According to Merriam-Webster:
2a: secure from threat of danger, harm, or loss
3: affording safety or security from danger, risk, or difficulty
6a: not likely to take risks : cautious
One might also use cautious or careful to describe driving style, but probably not prudent.