Synonyms of undecipherable

undecipherable

adjective

ˌən-dē-ˈsī-f(ə-)rə-bəl 

as in illegible

incapable of being read or deciphered

undecipherable stone inscriptions that have inspired a wide assortment of theories

Synonyms & Similar Words

• illegible
• obscure
• indecipherable
• unreadable
• faint
• unclear
• indistinct

Antonyms & Near Antonyms

• readable
• legible
• clean
• fair
• decipherable

Example Sentences

Recent Examples of undecipherable

Georgia relies on machines that count ballots by reading QR codes that are undecipherable to humans. — Caleb Groves, AJC.com, 29 Apr. 2026

The spirit and the symbolism were, at times, undecipherable. — The Know, Denver Post, 8 Feb. 2026

Several creators who previously worked day jobs tell Rolling Stone that there’s an ongoing stigma surrounding the idea of leaving a steady day job — a stigma that’s decided less by rules and more by undecipherable vibes. — Ct Jones, Rolling Stone, 26 July 2025

Hinton then offered an extremely detailed scientific explanation of why that's the case -- an explanation that would be undecipherable to anyone but an AI creator like himself. — Josh Meyer, USA TODAY, 4 May 2023

Other inventions included a mysterious writing system that remains undecipherable, and novel techniques in metallurgy. — Sam Walters, Discover Magazine, 1 Dec. 2021