puzzling

adjective

Difficult to explain or understand: arcane, cabalistic, cryptic, enigmatic, mysterious, mystic, mystical, mystifying, occult. See explain/baffle, knowledge/ignorance.

Definition: very confusing
Antonyms: clear, comprehendible, comprehensible, intelligible, straightforward, understandable

The adjective has 2 meanings:

Meaning #1: not clear to the understanding
  Synonyms: enigmatic, enigmatical

Meaning #2: lacking clarity of meaning; causing confusion or perplexity
  Synonyms: confusing, perplexing