nieżyciowy v angličtině:

... Now this is a fanciful theory.

Stop that fanciful story and tell me what really happend.

This may sound fanciful, but believe me, it is true.

She had rather unrealistic expectations of marriage.

He is unrealistic.

Life on a desert island. Most of us have formed an unrealistic picture of life on a desert island. We sometimes imagine a desert island to be a sort of paradise where the sun always shines. Life there is simple and good.

She has a totally unrealistic view of life. [+ to do sth] It's unrealistic to expect their decision before Tuesday.

Parents look to the new generation as a generation that is far from reality and busy running after unrealistic dreams.

The feelings of "love at first sight" and "faithful unto death" are unrealistic; this sort of unrealistic and illusory feeling is not what we need.