adjective
draconian
druh-KOH-nee-un/drəˈkəʊniən/
Excessively harsh or severe.
The school's draconian rule imposes suspension for arriving one minute late.

Etymology
Originally meaning “relating to Draco,” the adjective recalls an Athenian lawgiver whose code prescribed death even for minor crimes. His name consequently became a byword for exceptionally harsh laws and punishments.
In context
… the smallest transgression draws a draconian punishment …
More examples
- Employees call the ban on personal phone calls draconian.
- Draconian budget cuts leave the library open only one day a week.
- The school abandons its draconian discipline policy after parents protest.