Fetching details from the dictionary...

generally; mainly; usually; normally; mostly; for the most part
nearly all; almost all; most
gist; summary; outline; main idea
staying within bounds; not overdoing (something); not getting carried away; not going too far; being moderate
probably; perhaps; in all likelihood
considerably; greatly; really
説明を聞いて大概の内容は理解できました。
I understood the general content.
状況について大概の見当はついています。
I have a rough idea.
大概にしておかないと上司に怒られます。
I'll be scolded if I don't keep it moderate.