"unmistakable feature" is correct and usable in written English.
You can use it to describe a characteristic that is easily recognized and not likely to be confused with something else. For example: "The bright yellow beak is an unmistakable feature of the canary."
For nearly a century, the station and its soaring stacks have stood sentry along the Hudson River, providing a treasured and unmistakable feature of the Yonkers skyline.
For the research crew flying south along the coastline in a Bell 206 Jet Ranger helicopter, he was an unmistakable feature on the landscape and an ideal subject in which to test the anesthetic drug combination of medetomidine and ketamine, or MK for short.
An unmistakable feature of the NHLP family is its close sequence similarity to the alpha subunit of NHase, which is described by TIGR01323 (Table 1 and Figure 3).
The structure has many unmistakable features: its twisted zigzag, Star of David-inspired shape, and its scar-resembling slashes for windows, which immediately reminded me of the wound that has been left on history by the Nazi holocaust.
While 10 of the 14 new works in the show are larger than usual for the artist, they feature unmistakable Ruscha motifs, like text over barren landscapes, and images of mountains, which harken back to his Metro Plot series of the late 90s.
A daring editorial marking Thursday's third anniversary of the Sichuan earthquake, featuring unmistakable references to detained artist Ai Weiwei, has vanished from the website of the newspaper that ran it.
This is the second song to feature the unmistakable saxophone of beloved bandmate Clarence Clemons.
In this approach, the new buzzword is biometrics, the science of identifying people through biological markers just as reliable as fingerprints, such as quick computerized scans of their faces, their palms, or even the insides of their eyeballs, whose detailed features are unmistakable signatures of self.
Paulino Gimenez was cleaning a painting that he believed was by a little known contemporary of Goya's when he uncovered hidden features bearing the unmistakable mark of the Spanish master.
During meetings at the office, he would pretend to doze off, with an expression of unmistakable bliss arranged across his features.
They've also branched out and created a line of salad dressings featuring wasabi's unmistakable zing which, if you've never experienced it, is a bit like being slapped in the face by a beautiful, irresistible woman.
