is that safe on YouTube?

CjTheFish said:

I see this all the time. It works and Google seems okay with it.

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** as long as the keywords are relevant

Socialpanda said:

you mean i have to use these kw list end of description??

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Yes, this is not a TOS violation, since google and YT need to index your video, it's harder for them to index a video content with no ttextual content around it...
they allow you to add X words as title and Y words as description and Z words as tags, so use it - all of it.

don't repeat the same exact kw too many times, and to be safe use kw that are really relates to your video, you can stuff long-tail kw as much as they allow, you can say:
"this video is about:
keywords1
keywords2
keywords3
keywords4
keywords5
keywords6
keywords7
keywords8 "

the result is in almost in realtime now, so you can check and see what works better