The incorrectly spelled word is "Instanteneous."

The correct spelling is "Instantaneous," which means happening or done in an instant or without any delay.

The other options, "Presumptuous," "Illegitimate," and "Lascivious," are spelled correctly and have the following meanings:

• Presumptuous: Refers to someone behaving or speaking with excessive confidence or overstepping their bounds.
• Illegitimate: Describes something that is not lawful, valid, or recognized by the law.
• Lascivious: Describes behavior or expressions that are lustful, lewd, or sexually provocative.