The Collaborative International Dictionary
Undermost \Un"der*most\, a. [From Under; cf. Aftermost.]
Lowest, as in place, rank, or condition.
--Addison.
Wiktionary
a. In the lowest position or state; bottom.
Usage examples of "undermost".
Jaffers cried in a strangled voice--holding tight, nevertheless, and making play with his knee--spun around, and fell heavily undermost with his head on the gravel.
The undermost was patterned with Terran roses which seemed to climb through a dense fog of overlying fabric.
But now they were rising again, the white ensign undermost as if in defiance.
No matter how it rolled, or which side was undermost, it would always be upright!
The undermost rings should have thin joints, those of each succeeding ring being slightly thickened.
British ranks, who care little what is undermost so long as they are uppermost.
Roman, hardly free from his mount, was undermost and wounded, so that the result seemed hardly doubtful.