How to Say "forgetfulness" in Spanish
The Spanish word for “forgetfulness” is “olvido” — B1 level. This is a very common word in everyday Spanish.

Examples
Su nombre cayó en el olvido después de que se retiró.
His name fell into oblivion after he retired.
El olvido de las llaves fue un problema menor.
The forgetfulness of the keys was a minor problem.
Pido perdón por mi olvido; lo apunté en mi agenda.
I ask for forgiveness for my lapse (of memory); I wrote it down in my planner.
Masculine Noun
Even though many Spanish nouns ending in '-o' are masculine, remember that 'olvido' requires the masculine article: 'el olvido'.
Noun vs. Verb Form
Mistake: “Using 'olvido' when you mean the verb 'olvidar': 'Yo olvido de comprar pan.'”
Correction: 'Olvido' is a noun (the act of forgetting). When you want to say 'I forget,' you use the verb form: 'Yo olvido comprar pan.' (or better, 'Se me olvida...')
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