1Of the nose: having no visible or prominent bridge.
2Having no bridge; specifically (of a body of water) not spanned by a bridge.
3figurative Of a disparity or difference: that cannot be bridged or reconciled; not bridgeable. Compare "bridge", "unbridgeable".
Late 18th century; earliest use found in Thomas Bridges (?1710–?1775), playwright and novelist. From bridge + -less.