Decline refers to the degenerating of something whereas obsolete refers to the outdating of something or that it is no longer in use.

I heard of the slothful Asiatics, of the stupendous genius and mental activity of the Grecians, of the wars and wonderful virtue of the early Romans--of their subsequent degenerating--of the decline of that mighty empire, of chivalry, Christianity, and kings.

He does not have much to give in these degenerate days.

The most degenerate people on the face of the earth.

These states are degenerate, that is they have the same energy.

This kind of situation is called a degenerate critical point.

When this happens, the states are said to be degenerate.

Or does the animal that is the friend of man, always degenerate in his low society?

And it certainly wouldn't help her fit into what she considered a degenerate age.

If more than one ground state exists, they are said to be degenerate.

The company's gone and now nobody knows how to make them; we're degenerate, I mean, that's what war does.

But if the first factor is simply degenerate, it must appear twice.

We are becoming a degenerate race, even in the simplest things.

However, "we have received also some degenerate stock from the same nation.

To Harrison, they seemed morally degenerate and bad for health.

Although, back in Europe, his work was considered degenerate and preposterous.

In particular authors often did not bother to check degenerate cases.

In twenty years we had found no trace of life but a few degenerate plants.

A set containing a single point is a degenerate continuum.

The cascade therefore has the form of a degenerate tree.

Such works were supposedly "the result of a degenerate imagination".

One of the survivors is a degenerate film star and national idol.

Can we help it that we're living in a world of degenerate scum?

Fox on homosexuality: "A degenerate act which goes against human nature."

He'd probably use it to try to prove his point about our degenerate society."

A degenerate form of the above - only the da included.

A degenerate interval is any set consisting of a single real number.

Frank had by this time gathered quite a following of degenerates.

"Never seen so many degenerates and parasites in one room before.

He certainly had a low opinion of all the rest as effete degenerates.

Let's start rebuilding while the rest of the degenerates are still disorganized.

The club was for degenerates, and she was happy to see it gone.

Then it would just be a parade of degenerates: Look who's loose - good luck!

That would bear some thought; they might not be the degenerates he had thought them.

It has been overrun with mutants and other such degenerates.

We'll sit tight a bit longer on our degenerates and less reliable Imperials.

"And who are these degenerates who make their living off the weak?

An inbred crowd of degenerates, if you ask me.

"These degenerates will say anything to save themselves."

Or they might shelter piratical degenerates who had become creatures of Chaos.

Or being around degenerates and perverts so much that you got that way yourself.

None of the degenerates seemed to know what had happened, but they knew it was something they couldn't explain.

Then can the degenerates and warlocks be scourged out of Sanctuary.

"I think you're both attributing way too much forethought to these degenerates.

"Culture is being infiltrated by degenerates," Hitler complains to the counselor.

"If you just went with someone who is popular with students, you'd have Madonna and all sorts of degenerates," he said.

What a terrible thing it is for our literary establishment to be peopled by degenerates like this, he felt.

If you needed proof that these people are total degenerates, that music would do it."

But on the other hand, if they're not used to working, isn't there a good chance that they're moral degenerates?

During his time with the degenerates, Maxim learns the true nature of the towers erected across the country.

Criminals and social degenerates often showed the same folds as scientists and artists.

If they've still got the guts to face us, they'll go after our degenerates as soon as they spot them."

The whole city's talking about you and the way you've degenerated.

Over the last 30 years or so, the practice has degenerated.

Without question, America's food safety system has degenerated over the past six years.

Most of us may not have degenerated into women, but it seems we are led by them.

But now, more than a decade later, the series has degenerated.

For them the whole thing had degenerated into a joke.

When school has degenerated into testing, why not take one test and be done with it?

He felt as if his life was degenerating into chaos.

The depression degenerated into an area of low pressure early the next day.

Now I'm terrified that things could have degenerated so far.

They said public health was degenerating to a level of the postwar years.

The rest of them are just degenerates, mostly rich people and well known.

A few generations later they had degenerated into near animals.

By the time of construction, the area had badly degenerated.

But his condition has steadily degenerated in the past year.

What was I to do if my venerable people really had become degenerated?

And how had their marriage degenerated so far, to the lowest possible level?

Being a public intellectual has degenerated from a calling to a career.

Have water conditions degenerated to the point where that great visibility is gone?

The great day dramas of your television have degenerated into nothing.

The road degenerated to a trail, so that they had to go single file.

Late on May 29, the system degenerated into a remnant low.

Her condition degenerated rapidly, and she died at the age of 73.

This degenerated into a miniature civil war in the days following.

For several years their relationship flourished, but by 2000 it had degenerated.