IPA: /ˈpʊrli/
KK: /ˈpʊrli/
In a state of bad health or feeling unwell.
She felt poorly after catching a cold.
In a way that is not good or satisfactory; lacking quality or effectiveness.
She performed poorly on the test, which affected her overall grade.
Poorly → It is formed from "poor" (from Old French *povre*, meaning lacking in material wealth) and "-ly" (meaning in a manner of). The word "poorly" means in a manner that is lacking or deficient.
Think of someone who is 'lacking' ('poor') and doing something 'in that manner' ('-ly'). This helps you remember that 'poorly' means to do something in a deficient way.