avyaktah—unmanifested Bg 8.21, SB 3.11.3
avyaktah—difficult to be known SB 3.24.37
avyaktah—invisible Bg 2.25
avyaktah—not manifested through ordinary knowledge SB 7.3.33
avyaktah—without being manifest SB 4.27.30
Can't find any compound Sanskrit words containing avyaktah.