[Olog-hai]

Returning a bill unsigned is a veto. Signing a veto statement is not required.

[Zhang Fei]

[Returning a bill unsigned is a veto. Signing a veto statement is not required.]

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https://www.senate.gov/reference/glossary_term/pocket_veto.htm
pocket veto - The Constitution grants the president 10 days to review a measure passed by the Congress. If the president has not signed the bill after 10 days, it becomes law without his signature. However, if Congress adjourns during the 10-day period, the bill does not become law.