My husband explained me that "ein-deutig" itself means "one-meaning". So a sentence or a saying "eindeutig" means: there is only one way to understand it. While "klar" only mean "it's clear" (maybe only for me). Plus you can say the water or the glass "klar", NOT "eindeutig". I hope this help!
Yes, I also wonder. There have been posts about other words that use the deut stem, but I don't know how close they are. When I took German in school, we learned to use Deutlich for clear as in, concise, speaking clearly. Klar seems to just be generic "clear", as in transparent or can be used in many ways. I'm not sure about the difference between eindeutig and deutlich, though. Maybe that will be cleared up, or hopefully someone else can help.
I also posted the same question below. I think I understand the difference now:
- Deutlich. Clear, as in 'articulate'
- Eindeutig. Clear, as in 'unambiguous'
You can be articulate (speak clearly, fluently, and coherently) while being ambiguous in meaning.
Tip: I use ein in eindeutig to remember it means 'unambiguous' (unambiguous -> only one meaning -> ein = one).
There is no word deutig.
Perhaps you're thinking of deutlich -- that means "clear" in the sense of "easily visible".
For example, it's easier to follow a track in the forest if it is deutlich.
Whereas eindeutig is "clear" in the sense of "unambiguous; you can understand it only in one way".
"Deutlich" is used when you can clearly see what is going on, e.g. cookies are missing on the kitchen table and the 7-year-old son has a chocolate snout, so you would say that it is clear that he has to do with the disappearance of the cookies. ;) "Deutlich" is not only used abstractly. If someone writes on a sheet in extra large and well readable letters, then one calls the writing also "deutlich".
"Eindeutig" is stronger than "deutlich". "Eindeutig" means that there is no other possibility. Related to the previously used example with the boy. According to the above description, there would still be the possibility that the 5-year-old daughter took the cookies and gave her brother some of them. But if the mother has seen the young boy stealing the cookies, then the situation is "eindeutig". "Eindeutig": "eins" + "deutlich": There is only one way to interpret the situation.