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Longman Dictionary of Contemporary English
unrealistic
adjective
COLLOCATIONS FROM OTHER ENTRIES
unreasonable/unrealistic expectations (=expectations that are too high)
▪ I think you had unrealistic expectations of what could be achieved in the time.
COLLOCATIONS FROM CORPUS
■ ADVERB
as
▪ We are disturbed that audiometry is regarded as unrealistic.
▪ With the continuing preponderance of the agricultural population this aspiration was not then as unrealistic as it might seem today.
▪ This would be as unrealistic and premature as Mr Rugova's call for immediate recognition of an independent state.
▪ It is the most transparent of the fictions it espouses, and is as unrealistic as it is unfair.
quite
▪ It's quite unrealistic to think of.
▪ In theory this sounds quite unrealistic but the worker is reassured that none of these topics need be committed to memory.
▪ Farmers had purchased land at quite unrealistic prices at the time of the reform and were not burdened with long-term borrowing.
▪ It seems to us quite unrealistic to say that he would have felt insulted.
▪ Family hostility often arises when the expectations of older people make quite unrealistic demands upon younger relatives.
▪ It seems to me quite unrealistic to divorce the buying of the chocolate from the supplying of the records.
totally
▪ Not only that, but it seemed totally unrealistic to me.
▪ Yet since she'd met this man ... Ridiculous and totally unrealistic.
▪ Our dieter is not launched into a totally unrealistic programme.
▪ In the circumstances such calls were not totally unrealistic.
▪ But there is no way he will be held to ransom over a figure which is totally unrealistic.
■ NOUN
expectations
▪ High and unrealistic expectations of the re-entry programme or proposed job.
▪ With beta software, it pays to be a pessimist and not harbor unrealistic expectations.
▪ Business people who enter the public service often have unrealistic expectations about the relationship with politicians.
▪ Today most high school students have wildly unrealistic expectations about their future.
▪ People sometimes have very unrealistic expectations.
▪ Many of us go to workplaces rife with dissatisfactions, unrealistic expectations and frenetic changes.
▪ She wished that she could rely on him and wondered where she had acquired such unrealistic expectations.
▪ Scientists often join these institutions with unrealistic expectations.
EXAMPLES FROM OTHER ENTRIES
unrealistic cost estimates
▪ I found the play boring and the characters unrealistic.
▪ The film is ruined by all the unrealistic plot twists.
EXAMPLES FROM CORPUS
▪ Critics say the program is unrealistic and a political ploy.
▪ It would be unrealistic to not expect to pay higher royalties in the foreseeable future.
▪ Therefore, the taking of warranties and indemnities will be a wholly unrealistic expectation.
▪ This model is unrealistic, but is used here to demonstrate the principles involved.
▪ This reaction is not unrealistic, since much communication is, in fact, evaluative.
▪ Thus many Great Groups are fueled by an invigorating, completely unrealistic view of what they can accomplish.
▪ To say there is absolutely no chance you would divorce is unrealistic.
▪ You might think, therefore, that this strategy is unrealistic, given the demands on time in the classroom.
Douglas Harper's Etymology Dictionary
unrealistic

1865, from un- (1) "not" + realistic. Related: Unrealistically.

Wiktionary
unrealistic

a. Not realistic.

WordNet
unrealistic

adj. not realistic; "unrealistic expectations"; "prices at unrealistic high levels" [ant: realistic]

Usage examples of "unrealistic".

For the same reasons that containment failed, it is unrealistic to imagine that it can be revived.

Personally, Sebastian had always viewed their attitude as more than a little unrealistic, but he was prepared to admit that that could have been his own prejudices talking.

And whether it was unrealistic as a personal philosophy or not, it was definitely one of the things which made them so effective in the diplomatic service, or as analysts and policymakers, capable of standing back from personal, adversarial approaches to policy debates.

He disapproved of them, in a depressingly mild sort of way, yet it was unrealistic to expect more from him.

She had once again shelved her one paltry erotic memory and her unrealistic fantasies.

Those same cynics said that it was an unrealistic commitment, naive and doomed to failure.

Such unrealistic expectations inevitably and invariably lead to disenchantment, disillusionment, bitter disappointment, seething anger, and a sense of humiliation for having been thus deluded, or, rather, self-deceived.

I thought how cozy and unrealistic it was for people to depend on gods and demons to define their roles in life.

I thought that she would think I was weird, or out of touch, or unrealistic and stupid.

But his emotional, unrealistic, involved-with-Emily self insisted that someone, somewhere had to know what happened to Daniel.

Taaffe -- which does not imply that blame for any of the unrealistic or tawdry aspects of the Metaverse should be placed on anyone but me.

As a rule Eddi Amsel, who was well versed in economics, answered prolixly and with facts which made the employment-promoting plan of the Party and Senate seem unrealistic.

The track coach suggested he run between classes, a bit unrealistic in view of all the unshoveled snow on the campus sidewalks.

He sympathized particularly with a fat woman writer of whodunits, whose extremely unrealistic yet amazingly popular Gray Lensman hero had lived through ten full-length novels and twenty million copies.

If one were tempted to use the above negative reasoning for the issue of dinosaur births, one would also have to consider the unrealistic idea of live birth for Mesozoic birds.