bekanntlich
as is well known
Used to introduce a fact that one assumes is generally known.
Geduld ist bekanntlich eine Tugend.
Patience, as is well known, is a virtue.

as is well known
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as is well known
Used to introduce a fact that one assumes is generally known.
Geduld ist bekanntlich eine Tugend.
Patience, as is well known, is a virtue.

The adverb 'bekanntlich' (as is well known) is derived from the adjective 'bekannt' (known). The ending '-lich' turns the adjective into an adverb meaning 'in a known way.'
Der Mount Everest ist der bekanntlich höchste Berg der Welt.
Mount Everest is, as is well known, the highest mountain in the world.
'Bekanntlich' (as is well known) can stand in two typical positions in a sentence. Either in position 1, in which case the verb follows immediately (inversion), or inside the sentence, usually directly after the conjugated verb.
Bekanntlich schläft unser Hund sehr viel.
As is well known, our dog sleeps a lot.
With 'bekanntlich' (as is well known), you signal that you assume the information is not new to the listeners or readers. It creates a shared knowledge base.
Rom wurde bekanntlich nicht an einem Tag erbaut.
Rome, as is well known, was not built in a day.
presumably
'vermutlich' and 'bekanntlich' both often come before a statement, but they show very different things. 'vermutlich' says: you are not completely sure, but it is likely. 'bekanntlich' says: the information is considered known or common knowledge. The words can be confused because both show the speaker's attitude toward the statement. The important point is certainty: with 'vermutlich', some doubt remains; with 'bekanntlich', you present something as a known fact.

Wasser gefriert bekanntlich bei null Grad.
Water, as is well known, freezes at zero degrees.
Der Termin fällt vermutlich aus, weil die Ärztin krank ist.
The appointment will probably be canceled because the doctor is sick.