Can いそがしい mean busy as in 'crowded'


I know 'いそがしい' means busy as in 'having important things to do', but can it
also mean busy as in crowded like 'busy street'




The normal way to say a place is busy, in the meaning of crowded, is 混んでいる,
though it is a verb. にぎやか is a similar concept, but is more like "lively" or
"happening" than "busy" in the sense that there are many people.




Generally, the answer is no. 忙しい only means 'having a lot of things to do'.

[忙しい街](https://www.google.com/search?q=%E5%BF%99%E3%81%97%E3%81%84%E8%A1%97)
seems possible, and 忙しい通り may be understood similarly (google search shows it
is not common), vaguely as streets where people are hectic.

