Ohisashiburi vs hisai?

right, while the word “ohisashiburi” is “long time no see” - why is there a similar word (I can’t remember it - learnt it today - sounds something like hisashi hisai or something that means “miserable”)?

I can not think of the words you mentioned, hisashi? hisai?
My wild guess is “hisan” which means miserable.
“ohisashiburi” comes from the word “hisashii” which means long time.

ohisashiburi desu neee, or gobusata itashimashita or shibaraku desu neee will all do, never heard of hisai.