Is there an alternative word/phrase to "ignorance is bliss?" [edited]

It's a classic phrase, but is there a word that encapsulates the sentiment of this idiom?

Edit:

Single word isn't a requirement, I'm just looking for a concise and eloquent alternative.

I don't have a specific sentence in mind; I think it's a beautiful idiom and I'm simply looking for alternatives to it.

In my opinion, context isn't required. Nonetheless, I've been asked to provide some degree of specificity: the first example that always comes to mind is the scene in The Matrix where Cypher is eating a steak and talking to the agent. Cypher says:

"I know this steak doesn't exist; I know that when I put in my mouth, the Matrix is telling my brain that it's juicy and delicious. After 9 years, you know what I realized? Ignorance is bliss."

Solution 1:

Oh, these work even better with your Matrix reference.

For a single word, try clueless: Lacking understanding or knowledge:

"Oh, for those wonderful days when I was clueless as to my husband's infidelities!"

Then there's unconscious from From Latin un + cōnscius : com-, com- + scīre, to know:

Happily unconscious of the new calamity at home, Miss Pross threaded her way along the narrow streets and crossed the river by the bridge of the Pont-Neuf, reckoning in her mind the number of indispensable purchases she had to make. - Dickens

Incognizant (lacking knowledge or awareness; unaware) is good:

It was with full cognizance of the worldwide melting of glaciers that we rode the telepherique up to gaze down at the glacier at the top of an incognizant world. - Donna Stonecipher

Insensible works:

Yes, cold and insensible Nymph, (replied I) that luckless swain your Brother, is no more, and you may now glory in being the Heiress of Sir Edward's fortune. - Jane Austen

And, asleep:

Now for the first time he FELT that he was asleep and dreaming. - Bram Stoker

Finally, delusional:

I miss labouring under the happy delusion that my life is interesting enough to tweet about.

Solution 2:

Blissful ignorance , but still two words, not one.