I have used 'comprehendible' in the past, but lately had someone claim I was using a made-up word, and instead should have used 'incomprehensible'. I am aware of both words and tend to use whichever arrives at my lips soonest, but I'm now unsure about which is correct.
Merriam-Webster's dictionary has 'comprehendible' as an adjective, basically meaning easily understood, and also has 'comprehensible' listed, meaning the same thing.
Some dictionaries don't recognise 'comprehendible' though, whilst others do list the word, with the aforementioned meaning.
Can someone shed some light please, and perhaps offer a reason for two words which one dictionary stated were synonyms, and as to why both exist?
I'm not sure why we have the two forms, which seem to have identical meanings. Maybe the two forms emerged at the same time and have been fighting it out since then, though the S form seems to be on top.