Unqualified means without the training needed, or complete and without reservation. An unqualified teacher, an unqualified success, unqualified support.
The two senses pull in opposite directions, and only the noun tells you which is meant. An unqualified success is a total one, while an unqualified practitioner is a problem.
1adjectiveunqualifiedWithout the training needed, or complete and without reservation.
“The clinic was closed after it emerged that the dentist was unqualified.”
unqualified is a quality.
From un- + qualified.
Etymology from Wiktionary, CC BY-SA