Formal:
* బుద్ధిమంతుడు (buddhi mantudu): This translates literally to "intelligent person" and is the most formal way to say "smart."
* పండితుడు (panditudu): This translates to "scholarly" or "learned" and implies intellectual depth.
Informal:
* చాకచక్యం (chakachyakam): This means "cleverness" or "resourcefulness" and is a more informal way to say "smart."
* సమర్థుడు (samarthaadu): This means "capable" or "competent" and can also be used to describe someone who is smart.
* బుద్ధి (buddhi): This simply means "intelligence" and can be used in some contexts.
The best way to choose the right word depends on the situation. For example, you might say "buddhi mantudu" to describe a brilliant scientist, but "chakachyakam" to describe a clever salesperson.