unclearest
un-clear-est
adjective
Most difficult to understand or interpret; furthest from being clear or distinct.
"That was the unclearest explanation I've ever heard."
Thesaurus
Synonyms: ill-defined, unclear, obscure, confusing, vague, amorphous, blurred, puzzling, clouded, perplexing, unreadable, indecipherable
Antonyms: clear, well-defined