hazy, vague, indistinct, or confused

a nebulous recollection of the meeting; a nebulous distinction between pride and conceit.

cloudy or cloudlike.

of or resembling a nebula or nebulae; nebular.

adjective

apparent , definite , obvious , plain

adjective

ambiguous , amorphous , cloudy , dark , dim , hazy , imprecise , indefinite , indeterminate , indistinct , misty , murky , shadowy , shapeless , uncertain , unclear , unformed , vague , equivocal , inexplicit , obscure , foggy