Rav Yehudah said in the name of Rav: The first Adam spoke in the Aramaic tongue, as it is said (Psalms 139:17), "How precious to me are Your thoughts, O God." And this accords with what Resh Lakish said: What is the meaning of what is written, "This is the book of the generations of Adam"? It teaches that the Holy One, blessed be He, showed the first Adam generation after generation and its expounders, and so forth. When he reached the generation of Rabbi Akiva, he rejoiced in his Torah and was grieved by his death, as it is said, "How precious to me are Your thoughts [re'echa], O God."
Adam Spoke Aramaic and Grieved for Rabbi Akiva
Yalkut Shimoni on Torah 41:1
אָמַר רַב יְהוּדָה אָמַר רַב, אָדָם הָרִאשׁוֹן בְּלָשׁוֹן אֲרַמִּי סִפֵּר, שֶׁנֶּאֱמַר (תהלים קלט, יז) "וְלִי מַה יָּקְרוּ רֵעֶיךָ אֵל" וְהַיְנוּ דְּאָמַר רֵישׁ לָקִישׁ, מַאי דִּכְתִיב זֶה סֵפֶר תּוֹלְדֹת אָדָם, מְלַמֵּד שֶׁהֶרְאָה לוֹ הַקָּדוֹשׁ בָּרוּךְ הוּא לְאָדָם הָרִאשׁוֹן דּוֹר דּוֹר וְדוֹרְשָׁיו וְכוּ' כֵּיוָן שֶׁהִגִּיעַ לְדוֹרוֹ שֶׁל רַבִּי עֲקִיבָא שָׂמַח בְּתוֹרָתוֹ וְנִתְעַצֵּב בְּמִיתָתוֹ, שֶׁנֶּאֱמַר "וְלִי מַה יָּקְרוּ רֵעֶיךָ אֵל".