an unqualified or dishonest practitioner of medicine

a person who pretends to have skills or knowledge he or she does not possess

एक व्यक्ति जो कौशल या ज्ञान का दिखावा करता है जो उसके पास नहीं है

English Usage: She felt that some employees at the company were just quacks, not adequately trained.

Hindi Usage: उसने महसूस किया कि कंपनी के कुछ कर्मचारी सिर्फ अयोग्य थे, पर्याप्त प्रशिक्षित नहीं थे।

to make the characteristic sound of a duck

to speak or act in a pretentious manner

दिखावे के तरीके से बोलना या कार्य करना

English Usage: He tends to quack about his achievements, though they are often exaggerated.

Hindi Usage: वह अपने उपलब्धियों के बारे में दिखावा करता है, हालाँकि वे अक्सर अतिशयोक्तिपूर्ण होते हैं।