For clumsiness:
* "Shlepper" (שְׂלוֹפֶּר): This word describes someone who is constantly tripping, bumping into things, and generally clumsy.
* "Klutz" (קלוץ): While not strictly Yiddish, this word is widely used in Yiddish-speaking communities and carries the same meaning as "clumsy."
* "Shmutzik" (שמוציק): This word describes someone who is messy and uncoordinated, which can often lead to clumsiness.
For awkwardness:
* "Shmegegge" (שְׂמֶגֶגֶּ): This word describes someone who is foolish and clumsy, often in a humorous way.
* "Shlemiel" (שְׂלוֹמֵּל): This word describes someone who is foolish and unlucky, often leading to awkward situations.
* "Nosh" (נוֹשׁ): This word can be used to describe someone who is socially awkward and uncomfortable.
Combinations:
You could also use combinations of these words to express the specific nuance you're looking for. For example, you could say "a shlemiel shmegegge" to describe someone who is both clumsy and socially awkward.
Ultimately, the best word to use will depend on the specific context and the nuance you want to convey.