Peace be upon you. Yes, Allah referred to Adam's action as disobedience, and it is true that Adam (peace be upon him) went against what he was forbidden. However, the important question is whether this disobedience undermines Adam's infallibility. There are many answers to this, the most famous being that he (peace be upon him) acted against what was preferable, and the prohibition against approaching that tree was advisory rather than authoritative, thus it does not affect his infallibility at all. The evidence for this advisory nature is found in Surah Taha, where Allah says: {Indeed, you shall not go hungry therein nor shall you be naked * And that you shall not thirst therein nor shall you suffer from the sun's heat} [Taha: 118-119]. So, do not approach the tree, and if you do, you will be expelled from Paradise. As for the verse {So he was led astray}, it means, as stated by Al-Sharif Al-Murtada, that he was disappointed. There is a poetic reference: 'Whoever does good is praised by people, and whoever is led astray will not lack for blame.' [Tanzeeh Al-Anbiya, Al-Sharif Al-Murtada, p. 9]. The concept of being led astray is contrasted with receiving good, indicating a sense of disappointment. For a complete answer, please refer to the book Tanzeeh Al-Anbiya. May you be successful in all good.