• umpteeth,
• ymptieth,
• hmptieth,
• jmptieth,
• imptieth,
• 8mptieth,
• 7mptieth,
• unptieth,
• ukptieth,
• ujptieth,
• umotieth,
• umltieth,
• um-tieth,
• umptith,
• umpteith,
• umptiethh,
• umpetheth,
• umptiteeth,
• umpetith,
• umpeteeth

• umpteenth,
• umpteen.

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

The plural form of the word "umptieth" is "umptieths".

The singular form of the word "umptieth" is "umptieth". The word does not change in the singular form. It is an indefinite numerical term used to refer to an unspecified number in a sequence or series.