This is the 567th most frequent Afrikaans word.
onwettige
"Onwettige" means "illegal" in English.
The word 'onwettige' is used here as an adjective to describe the noun 'handeling' (act), indicating that the act was unlawful or not permitted by law.
Hy het 'n onwettige handeling gepleeg.
He committed an illegal act.
Here, 'onwettige' qualifies 'verhouding' (relationship), implying that the relationship is unauthorized or socially/morally considered unacceptable.
'n Onwettige verhouding kan probleme veroorsaak.
An illicit relationship can cause problems.
In this sentence, 'onwettige' serves as an adjective describing 'middel' (substance), showing that the substance's use is against the regulations or law.