
allgemein
general
Concerning all or most people or things; valid for everyone and not limited to a specific case.
Rauchen ist in öffentlichen Gebäuden allgemein verboten.
Smoking is generally prohibited in public buildings.
general
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general
Concerning all or most people or things; valid for everyone and not limited to a specific case.
Rauchen ist in öffentlichen Gebäuden allgemein verboten.
Smoking is generally prohibited in public buildings.

general
Not detailed or specific; vague or superficial.
Deine Kritik ist zu allgemein, du musst konkreter werden.
Your criticism is too general; you need to be more specific.

in general
As a rule; mostly; normally.
Im Allgemeinen sind die Menschen hier sehr freundlich.
In general, the people here are very friendly.
The word is made up of 'all' (all) and 'gemein'. Here, 'gemein' does not mean 'mean' or 'nasty', but rather 'shared' or 'common', as in the word 'Gemeinde' (community/municipality). So 'allgemein' literally means 'shared by all'.
Das ist eine Frage von allgemeinem Interesse.
That is a question of general interest.
The expression 'im Allgemeinen' (in general) is a fixed adverbial phrase and means 'normally'. If it stands at the beginning of a sentence, the verb follows in position two (inversion).
Im Allgemeinen schließt das Geschäft um 18 Uhr.
In general, the shop closes at 6 p.m.
Common combinations are 'allgemein bekannt' (generally known), 'allgemein gültig' (generally valid), or 'allgemein zugänglich' (generally accessible). It also occurs in fixed terms such as 'allgemeine Geschäftsbedingungen' (general terms and conditions, AGB) or 'der allgemeine Wille' (the general will).
Es ist allgemein bekannt, dass Sport gesund ist.
It is generally known that exercise is healthy.
In the meaning of 'not specific', 'allgemein' (general) is often used in a critical context, frequently intensified with 'zu' (too). A statement is then 'zu allgemein' (too general) to be useful.
Seine Antwort war mir zu allgemein, ich brauche mehr Details.
His answer was too general for me; I need more details.
at all / generally
Überhaupt and im Allgemeinen can both generalize a statement. Im Allgemeinen describes what is usually or mostly true. überhaupt broadens the scope of the discussion more strongly and considers the topic as a whole. For a usual general case, im Allgemeinen is the better choice.

Im Allgemeinen reagieren Menschen auf klare Regeln positiv.
In general, people respond positively to clear rules.
Überhaupt reagieren Menschen auf klare Regeln meist positiv.
In general, people usually respond positively to clear rules.