Sentence:  Nor has Dalua part or mention in the antique legend. Like other ancient things, this divinity hath come secretly upon us in a <WSD>forgetful</WSD> time, new and strange and terrible, though his unremembered shadow crossed our way when first we set out on our long travel, in the youth of the world. 
Meaning of the word marked with <WSD> tags:  unable to remember things well; liable to forget.