riguroso
adjetivo
1 [+control, dieta, disciplina] strict; [+actitud, castigo] severe; harsh; [+medida] tough
es muy riguroso con sus empleados he's very strict with his employees; iban de luto riguroso they were wearing deep mourning; exigen un cumplimiento riguroso de los acuerdos they're demanding strict compliance with the agreement; en riguroso orden alfabético in strict alphabetical order