1. Imper, it seems to me; I think.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• shethinks,
• methonds,
• meethings,
• mthink,
• methink,
• metchinkov,
• methinal,
• nethinks,
• kethinks,
• jethinks,
• mwthinks,
• msthinks,
• mdthinks,
• mrthinks,
• m4thinks,
• m3thinks,
• merhinks,
• mefhinks,
• meghinks,
• meyhinks

The adjective form of the word "methinks" is "methinking".

The plural form of the word "methinks" is not commonly used because it is an old-fashioned term that was mostly used in Middle English. However, if one were to use a plural form, it would be "we methink" or "they methink" depending on the subject pronoun.

The singular form of "methinks" is "methink".