2 adjectives to describe intangibility

The phantoms of his boyhood, bulky and stiflingly near, had a monstrous reality, yet the ghostly intangibility that mocked his sword-thrusts of tortured inquiry.

I was but a thin, loose-jointed boy at the timefond of the pretty intangibilities of romance, and of dreaming when broad awake; and, woful change!

2 adjectives to describe  intangibility