Synonym Dictionary

Unable to be changed.

Free from faults or errors.

Unable to be entered or passed through; also impossible to understand or interpret.

Not allowing a substance to pass through.

Unlikely to happen or to be true.

Unable to be taken away or transferred.

So outstanding as to have no equal; also unsuitable for meaningful comparison.

So firmly established that it cannot reasonably be challenged.

Beyond reasonable doubt or disagreement.

So similar that a meaningful difference cannot be recognized.

Unfair or unequal in an unjust way.

Certain to occur or impossible to avoid.

Difficult or impossible to explain.

So closely connected or entangled that separation is difficult or impossible.

Impossible or very difficult to satisfy.

Extremely difficult to tolerate.

Impossible to overcome.

Too great or difficult to overcome.

Able to replace one another in use without an important difference.

Seeming to continue endlessly.

Difficult to manage, control, or resolve.

Beyond recovery, correction, or improvement in the relevant context.

Impossible to repair or put right.

Easily annoyed or provoked.