Enigmatic, Enigmatical, a.
Etymology: [Cf. F. énigmatique.]
Relating to or resembling an enigma; not easily explained or accounted for; darkly expressed; obscure; puzzling; as, an enigmatical answer.
Shades of meaning
Fernald has no entry of its own for enigmatical; he lists it under equivocal, mysterious, obscure.
Where he writes about it:
That which is enigmatical must be guessed like a riddle; a statement may be purposely made enigmatical in order to provoke thought and study. — from equivocal
Synonyms
equivocalmysteriousobscureabstruseambiguouscabalisticcloudycomplexcomplicateddarkdarksomedeepdensedifficultdimdoubtfuldubiousduskyenigmatichiddenincomprehensibleindefiniteindeterminateindistinctinexplicableinscrutableintricateinvolvedmuddymysticmysticaloccultperplexingprofoundquestionablereconditesecretsuspicioustranscendentalturbiduncertainunfathomableunfathomedunintelligibleunknown