ausnahmslos
without exception
Without any exception; applying to everyone and everything.
Die neue Regelung gilt ausnahmslos für alle Abteilungen.
The new regulation applies without exception to all departments.

without exception
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without exception
Without any exception; applying to everyone and everything.
Die neue Regelung gilt ausnahmslos für alle Abteilungen.
The new regulation applies without exception to all departments.

The word is clearly compounded: it consists of 'Ausnahme' (exception), the linking element '-s-', and the ending '-los', which means 'without'. So 'ausnahmslos' literally means 'without exception'.
Alle Mitarbeiter, ausnahmslos, müssen an der Schulung teilnehmen.
All employees, without exception, must take part in the training.
As an adverb, 'ausnahmslos' (without exception) can stand in different positions in the sentence. It often stands directly before 'alle' (all) or 'jeder' (everyone) to intensify them. It can also stand at the beginning of the sentence for emphasis.
Diese Regel gilt für ausnahmslos alle.
This rule applies to absolutely everyone.
'Ausnahmslos' (without exception) sounds more formal and stronger than simply 'alle' (all). It is often used in official contexts, rules, or instructions to emphasize that there really are no exceptions.
Das Rauchverbot auf dem gesamten Gelände gilt ausnahmslos.
The smoking ban applies without exception throughout the entire premises.
partly
'teilweise' and 'ausnahmslos' are strong opposites. 'teilweise' means that something applies only in part or is not true everywhere. 'ausnahmslos' means that it really applies to everyone or everything and that no exception is allowed. So 'teilweise' fits when some cases are different. 'ausnahmslos' fits when you want to say especially clearly: no one or nothing is excluded.

Im Labor müssen ausnahmslos alle Mitarbeitenden Schutzbrillen tragen.
In the lab, all employees must wear safety goggles without exception.
Zu Hause bezahlt sie die Rechnungen teilweise selbst.
At home, she pays the bills partly herself.