indecipherable

[ in-di-sahy-fer-uh-buh l ]

/ ˌɪn dɪˈsaɪ fər ə bəl /

not decipherable; illegible.

not understandable; incomprehensible.

Origin of indecipherable

First recorded in 1795–1805; in-³ + decipherable

in·de·ci·pher·a·bil·i·ty, in·de·ci·pher·a·ble·ness, noun in·de·ci·pher·a·bly, adverb

Yet how, in this age of protean trends and indecipherable jargon, are we to draw the line?

When Not to Take a Selfie |James Poulos |December 11, 2013 |DAILY BEAST
Nuclear jargon has evolved into a code that is indecipherable to the layman.

Be Afraid, Very Afraid |Nathaniel Rich |March 15, 2011 |DAILY BEAST
His edits often were indecipherable, mysterious marks on the side of the page written with a Sharpie.

The Rove You Don't Know |Matt Latimer |March 9, 2010 |DAILY BEAST
It satisfied in some measure the vague, indecipherable yearning of my soul; and it was the same with him.

The White Peacock |D. H. (David Herbert) Lawrence

Their wandering glances were as indecipherable as the mystery of their abortive and useless existences.

An Iceland Fisherman |Pierre Loti
The staff is fully occupied upon the work in hand, and cannot wade through pages of often indecipherable hand-writing.

Practical Cinematography and Its Applications |Frederick Arthur Ambrose Talbot
He had saluted her with elaborate civility, his eyes distended with indecipherable meanings.

Ann Veronica |H. G. Wells
And then, I am sorry to say, the cryptogram is indecipherable.

Eight Hundred Leagues on the Amazon |Jules Verne

indecipherable

/ (ˌɪndɪˈsaɪfərəbəl, -frəbəl) /

not decipherable; illegible

indecipherability or indecipherableness, noun indecipherably, adverb