וְהַנָּחָשׁ֙ הָיָ֣ה עָר֔וּם מִכֹּל֙ חַיַּ֣ת הַשָּׂדֶ֔ה אֲשֶׁ֥ר עָשָׂ֖ה יְהוָ֣ה אֱלֹהִ֑ים וַיֹּ֙אמֶר֙ אֶל־הָ֣אִשָּׁ֔ה אַ֚ף כִּֽי־אָמַ֣ר אֱלֹהִ֔ים לֹ֣א תֹֽאכְל֔וּ מִכֹּ֖ל עֵ֥ץ הַגָּֽן׃
Змей был самым хитрым из всех зверей полевых, созданных Господом Богом. Он спросил у женщины: — Правда ли, что Бог сказал [вам]: “Не ешьте [плодов] никакого дерева в этом саду”?
Rashi
והנחש היה ערום AND THE SERPENT WAS MORE SUBTLE — What connection is there between the following narrative and the statement just made? The latter should have been followed by: “and He [the Lord God] made for Adam and his wife garments of skin and clothed them” (3:21), but Scripture informs you with what plan the serpent assailed them: he saw them naked and unashamed and he coveted her (Eve) (Genesis Rabbah 18:6).
Bekhor Shor
The serpent was more cunning: It spoke to the woman with wisdom and slyness.
Chizkuni
והנחש היה ערום, we must assume that the serpent per chance had already eaten from the tree of knowledge, as the warning not to eat from it was issued not only to man.