in the main

For the most part

In the main means for the most part or generally speaking.

It acknowledges exceptions while asserting an overall tendency: The weather was, in the main, cooperative.

The phrase sounds slightly formal or literary compared to alternatives like mostly or on the whole.

generally

mostly

For the greater part

principally · chiefly · essentially · substantially · broadly · overall · typically · usually · commonly · ordinarily

Opposites
degree of generality

in the mainwithout exception

True for all cases

rarely · seldom · hardly ever · almost never · absolutely

Family

main, mainly, maintain, maintenance, mainstream, mainland, mainline, mainframe

Familiarity
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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G