1. without feet or lacking feet
Usage: literal sense; often used in biology or zoology
2. lacking a sound basis or foundation; groundless or illogical
Usage: figurative sense; informal

Examples

• Snakes are footless reptiles that move by slithering.
• The argument was footless and failed to convince anyone.
• Some amphibians are footless or have very small limbs.
• His footless claim about winning the lottery was dismissed immediately.
• Worms are footless creatures that burrow through soil.
• The theory rested on footless assumptions and poor evidence.