"Such" is a hard word to explain. It's one of those words you just have to get a feel for. It can be like "tant que" and "tel," "tellement," "comme" and "ce genre de." Here are some various examples. That was such a hard test! (that test was so hard) That is such a great idea. (that really is a good idea - your example!) Such people are annoying. (those kind of peopole are annoying) Such is life (life is like that) Such a pleasure to meet you (it was really a pleasure to meet you - like the good idea above) I never did such a thing (I never did a thing like that)

We sometimes use it like "tellement" to add weight: It's such a pity that he couldn't go on the trip with us. It was such a relief to hear from them after the earthquake. I didn't think I would learn such a difficult language as French!

1: a : of a kind or character to be indicated or suggested <a bag such as a doctor carries> b : having a quality to a degree to be indicated <his excitement was such that he shouted> 2: of the character, quality, or extent previously indicated or implied <in the past few years many such women have shifted to full-time jobs> 3: of so extreme a degree or quality <never heard such a hubbub> 4: of the same class, type, or sort <other such clinics throughout the state>