unintentionally
UK: ˌʌnɪnˈtenʃənəli | US: ˌʌnɪnˈtenʃənəli
adv. in a way that is not deliberate or planned
adv. accidentally or without awareness
The word "unintentionally" is built from the negative prefix "un-" (Old English "un-," meaning "not") attached to "intentional," which derives from Latin "intentio" (from "intendere," meaning "to aim"). The suffix "-ly" converts the adjective "unintentional" into an adverb. The layered structure reflects a logical progression: starting with a core concept ("intent"), negating it ("unintent"), forming a noun ("intention"), then an adjective ("intentional"), and finally an adverb ("unintentionally").
She unintentionally offended him with her comment.
The error was made unintentionally during the data entry process.
He unintentionally left his keys at the restaurant.
The joke was unintentionally harsh.
The document was unintentionally deleted from the system.