1. Farthest out.

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

• poutermost,
• intermost,
• upermost,
• utermost,
• outtermost,
• aftermowst,
• afermost,
• outermoset,
• outermosyt,
• outermosty,
• outemost,
• outermostt,
• ottermost,
• outtrhust,
• uttermost,
• outwreest,
• utermosts,
• Osteomist,
• Outermose,
• Outhermost

• outturn.

The adjective form of "outermost" is "most outer".

The plural form of "outermost" remains the same as the singular form, as it is an adjective that describes the superlative degree.

The singular form of "outermost" is "outermost". The word does not change in singular or plural form.