Without a leg to stand on?

• Lacking limbs
• Footless
• Without feet
• Lacking feet
• Like worms or eels
• Having no feet

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1769, from Greek apous (from apod- "footless," from a- , privative prefix, see a- (3), + pous "foot;" see foot (n.)) + -al .

Wiktionary Word definitions in Wiktionary
a. (context biology English) without feet or foot-like body parts; legless

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Apod \Ap"od\, Apodal \Ap"o*dal\, a. [See Apod , n.] Without feet; footless. (Zo["o]l.) Destitute of the ventral fin, as the eels.