The word "undecipherable" is correct and usable in written English.
You can use it when you want to describe something that cannot be understood, decoded, or interpreted. Example sentence: The ancient runes inscribed on the wall were undecipherable.
There is a lot of background noise, with people speaking and shouting at the same time and parts are undecipherable, but here is her translation: Voice off camera: You dog, you filthy... What is your name?
The Winchester Troper includes 3 Introits, 53 Alleluias, 19 Tracts, and 7 Sequences in undecipherable note-against-note organum.
An undecipherable hymn engraved in stone, dating from about 800 bce, is evidence of a primitive system of musical notation.
Asked if anyone gave them shit for not conforming to the "unreadable, undecipherable font" tradition, he replied: "Nope - the opposite.
Under a tombstone of river water, his Collection was buried, soaked to undecipherable pulp.
This riveting account of thug life — the unglamorous, impoverished variety — is punctuated by constant profanity and undecipherable slang, occasional violence, steady drinking and weed or crack smoking.
The chianti-stained pappardelle listed on the menu turned out to be white pappardelle with ragout — a mess of poorly resuscitated pasta in a sauce bobbing with dry lumps of undecipherable meats.
In other crucial ways, though, the meaning of Pasolini remains undecipherable, ambiguous, suspended.
With its sheer beauty, the print dispels the distance between the viewer and the artist; with its hidden meaning, undecipherable to an American, it makes 90 miles seem unbridgeable.
To boot, she did use the phrase "loud and proud" — that's not exactly an undecipherable code.
The chicken came with terrific mushroom risotto, though, and stems of broccolini — better accompaniments than the dark, undecipherable, rough-textured wild mushroom cake that was served with a few other entrees.
