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When would one be used? I don't understand the difference between them.
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2014-04-10T21:13:58.090
15370
2014-04-10T21:43:16.923
4516
question
word-choice usage
Is there difference between 大事／大した
事【じ】 is a matter, so 大事【だいじ】means a "serious matter".

大【たい】した places less emphasis on the "matter" and more on being "big", so can
simply mean "very" or "much".

As an example

> 国家安全保障【こっかあんぜんほしょう】の大事【だいじ】 - a matter of national security

and

> 彼女【かのじょ】は大【たい】した歌手【かしゅ】になるはず - she will definitely become a (very big)
> singer

As per their negative counterparts, I find that in a colloquial sentence the
following would seem a bit more formal:

> 大事【だいじ】ではない ー (it's not a big issue)

whereas this sounds more natural:

> 大【たい】したこと（では）ない ー (no biggie)
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2014-04-10T21:27:47.913
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2014-04-10T21:43:16.923
2014-04-10T21:43:16.923
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answer