Absolutely not. It sounds diminutive and lazy. My coworkers use this phrase all the time and I respect them less for it.
The interjection "Hi!" is an informal greeting which is very widely used. Because of its informal nature, you would not use it in greeting, for example, a person of great authority. Nonetheless, its wide usage makes it very much part of the English language. What constitutes "proper" will depend on your definition. Do you mean "formal", or do you mean "used by English speakers"?
Yes, it is a greeting
Hi mean hello/greetings and people respecting you with a nice word
Hello is a greeting, while Hi is an informal greeting.
It was a shorter term for "hello".
hi is a greeting
hi means a greeting to someone familar. Being kind greeting someone.
'Hi' is a shortening of an 'Hello, how are you?' It is a greeting.
Bye, sup, and hi are all greetings. 'Sup', and 'hi' being ones that you would say when meeting someone, and 'bye' being a greeting you'd use when you're leaving or hanging the phone up.
Because 23 is the center of all life.
Greeting - short for hello in the begining of a conversation or meeting for the first time. Anthony Fraser
The Tagalog word for "hi" is "kamusta" or "kumusta."