In The Main (Adverb)

For the most part; "he is mainly interested in butterflies".

Travelers in the region are in the main friendly to outsiders.
In the main, politicians tend to be naturally good speakers.
The conference attendees were in the main satisfied with the proceedings.
For the most part the terrain was rugged, but in the main it was reasonably accessible.
In the main, the company's managers were hesitant to fire the unproductive employee.

Without distinction of one from others; "he is interested in snakes in general".

The new policy is good in the main, but it has some drawbacks that need to be addressed.
Her views on politics are sound in the main, but she can be quite radical on some issues.
The company's financial reports are encouraging in the main, though there are some concerns about the debt levels.
The tourists were generally happy with the hotel services in the main, but some had issues with the food.
The school's curriculum is excellent in the main, but some parents feel it is too narrow in scope.