unbridgeable
Word family
Synonym discussion
Sense: adjective/1
These words all describe something that cannot be overcome, but each highlights a different angle. 'Unbridgeable' is the most vivid and specific: it pictures a gap between two sides — like a canyon between people or groups — that is simply too wide to close. 'Irreconcilable' focuses on the impossibility of making two positions compatible; it is common in legal and political contexts (e.g. 'irreconcilable differences' in divorce). 'Insurmountable' is broader — any obstacle that cannot be overcome, whether a physical barrier, a problem, or a challenge. 'Unresolvable' is the most analytical, describing a problem that has no solution. For everyday disagreement, 'unbridgeable' is the most natural choice: 'The trust between them was gone, leaving an unbridgeable silence.'
Common collocations
Etymology
Formed by adding the prefix 'un-' (meaning 'not') to 'bridgeable', which itself comes from 'bridge' (Old English 'brycg' — a structure for crossing water) plus the suffix '-able' (meaning 'able to be'). The word first appeared in the mid-1800s and was at first used for physical gaps that could not be crossed, before taking on its more common metaphorical meaning about disagreements between people.
First known use
1799
1799, in the meaning defined above