Synonyms for Puzzling:

adj.

abstruse (adjective)
complicated, intricate, complex.
ambiguous (adjective)
enigmatical, uncertain, cryptic.
complex (adjective)
mysterious, perplexing, abstruse, complicated, confused, complex, intricate, obscure, involved, convoluted, difficult.
complicated (adjective)
convoluted, elaborate.
cryptic (adjective)
mysterious, occult, arcane, cabalistic, mystic, mystical.
difficult (adjective)
hard.
incomprehensible (adjective)
uncomprehensible.
obscure (adjective)
mystifying, uncertain, ambiguous.
puzzling (adjective)
obscure, unclear, abstruse, difficult, enigmatic, ambiguous, involved, perplexing, mystifying, hard, incomprehensible.

n.

contorted, elaborate, confused. puzzling (noun)
incomprehensible, uncomprehensible, enigmatic, confusing, unclear, perplexing, enigmatical.

Other synonyms:

cabalistic, mystifying, mystical, arcane. mystic, cryptic. occult. Other relevant words:
enigmatical, ambiguous, confusing, arcane, uncomprehensible, incomprehensible, hard, confused, mystifying, cabalistic, cryptic, occult, uncertain, unclear, enigmatic, mystic, mystical.

Usage examples for puzzling

  1. Tiza suddenly dried her eyes and looked at Milly, with a bright expression which was very puzzling – Milly and Olly by Mrs. Humphry Ward
  2. The whole subject is puzzling – Pagan & Christian Creeds Their Origin and Meaning by Edward Carpenter
  3. It was uncommonly puzzling – The Loudwater Mystery by Edgar Jepson