Both nucleophilic and electrophilic.
Example: \(\ce{CH2=O}\)
Note: The distinction between ambi (Latin: both) and amphi (Greek: both) and the application to hydrophilic and lipophilic or to nucleophilic and electrophilic is arbitrary.
Source:
PAC, 2022, 94, 353. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 2021)' on page 360 (https://doi.org/10.1515/pac-2018-1010)