The phrase "a sure indication" is correct and usable in written English.
It can be used when you want to express that something is a definite sign or proof of a particular situation or condition.
Example: "The sudden drop in temperature is a sure indication that winter is approaching."
Alternatives: "a clear sign" or "a definite signal".
But that finding wasn't a sure indication of clouds on the planet.
This curious juxtaposition is a sure indication of very muddled thinking.
"Traffic will be terrible," he complained, a sure indication that Federer knows New York better than it knows him.
His personal space was cramped by reporters — a sure indication that Stephon Marbury's travails are far from over.
This is a sure indication of the government's continuing failure to place enough emphasis on the voluntary sector.
A sure indication of stepping back, this official said, was the low-key approach since Secretary Powell returned from Israel last Saturday.
But the theory attracted only a fringe following until the late 1970s, when modern techniques proved that the visible universe doesn't contain nearly enough mass to explain the movements of galactic gas and dust-a sure indication something else is out there exerting a strong gravitational effect.
Chauvin and his colleagues even managed to obtain a spectrum of the exoplanet candidate, revealing water vapor in its atmosphere--a sure indication it's not a remote background star.
But without any change in the prior law or any sure indication that Beck's 'law' is the law of the future, the State of Washington in convicting Beck applies special and unfair treatment to him.
Another is Los Machos Beach, where we found a stray terrier-mix puppy, less than ten pounds, with mangy-looking fur, some scabs and cuts, skinny but with a distended belly -- a pretty sure indication of intestinal worms.
If he says yes, that's a pretty sure indication that he's interested in you, or at least that he really enjoys your company.
