1. Lowest in place, state or degree beneath others.

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

• underbust,
• intermost,
• inermost,
• utermost,
• underst,
• afermost,
• indermost,
• Underkast,
• undermastsd,
• undermasetd,
• undermoat,
• undermoast,
• undemost,
• undremost,
• undermost,
• Undurmost,
• Undarmost,
• Undervust,
• underbos,
• undarboss

The adjective form of the word "undermost" is "undermost".

The plural form of the word "undermost" is "undermosts".

The singular form of the word "Undermost" is "undermost". The word does not change in its singular form.