- Let's assume an inexperienced guy who doesn't know where to say what to a girl at the first meeting and says some irrelevant and out-of-place words which may even offend the girl.
- Let's suppose a serviceman who's not mastery of repairing a laundry machine, because he had just recently started his job and has not experienced various damages on a particular piece of the machine and accordingly is not well familiar with the way he should fix it.
- Please imagine a girl who does't know e.g. Salsa Dance well and when it comes to dancing, she constantly treads on her partners foot.
To me, they both are interchangeable in these senses and the only nuance that strikes to me is that "awkward" is a bit formal comparing to "clumsy".
Please note that I'm well aware that "awkward" is broader in meaning, but I'm specifically asking about these situations.
I have read the similar link, but still I cannot tell them apart!