Reference for Sanhedrin 7:8

הַמְחַלֵּל אֶת הַשַּׁבָּת, בְּדָבָר שֶׁחַיָּבִין עַל זְדוֹנוֹ כָרֵת וְעַל שִׁגְגָתוֹ חַטָּאת. הַמְקַלֵּל אָבִיו וְאִמּוֹ, אֵינוֹ חַיָּב עַד שֶׁיְּקַלְּלֵם בַּשֵּׁם. קִלְּלָם בְּכִנּוּי, רַבִּי מֵאִיר מְחַיֵּב וַחֲכָמִים פּוֹטְרִין:

One who desecrates the Sabbath through an act where witting transgression is subject to kareth, and unwitting transgression to a sin-offering (is liable to stoning). One who curses his father and mother is not liable (to stoning) unless he does so by the Name, [i.e., by one of the distinct names.] If he cursed them by an epithet ["Merciful," Gracious," "Long-suffering"], R. Meir says that he is liable; and the sages, that he is not liable.

Jastrow