The Adamic language is, according to certain sects within Abrahamic traditions, the language spoken by Adam and Eve

Adam and Eve

Adam and Eve were, according to the Genesis creation narratives, the first human couple to inhabit Earth, created by YHWH, the God of the ancient Hebrews...

 in the Garden of Eden

Garden of Eden

The Garden of Eden is in the Bible's Book of Genesis as being the place where the first man, Adam, and his wife, Eve, lived after they were created by God. Literally, the Bible speaks about a garden in Eden...

, i.e., either the language used by God

God

God is the English name given to a singular being in theistic and deistic religions who is either the sole deity in monotheism, or a single deity in polytheism....

 to address Adam, or the language invented by Adam (Book of Genesis 2:19).
Traditional Jewish exegesis such as Midrash

Midrash

The Hebrew term Midrash is a homiletic method of biblical exegesis. The term also refers to the whole compilation of homiletic teachings on the Bible....

 (Genesis Rabbah 38) says that Adam spoke Hebrew because the names he gives Eve - "Isha" (Book of Genesis 2:23) and "Chava" (Genesis 3:20) - only make sense in Hebrew.