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