A grandiose idea is one that is too big for you to actually be able to achieve. It's usually a lot more ambitious than what you're actually capable of.
The grandiose idea was to start his own business.
The grandiose idea was to write a novel.
The grandiose idea was to conquer the world.
adjective
affectedly genteel
Synonyms:
adjective
impressive because of unnecessary largeness or grandeur; used to show disapproval
1
It eliminates the ridiculous grandiose posturing.
2
The grandiose promises of artificial intelligence.
3
The grandiosity is just a momentary mask.
4
It gets more grandiose all the time.
5
The article doesn't make grandiose claims.
6
Also, isn't the scope of this article too grandiose
7
I don't buy the grandiose conclusions of this article.
8
The album is enhanced by its grandiose production style.
9
I've tagged for cites the grandiose claims of its effectiveness.
10
Someone recently made the language very grandiose in the intro.