Definitions

1. adjective

most sensitive to smells or having the strongest sense of smell

“He’s the sniffiest person I know, always complaining about the smell of his neighbor’s cooking.”

2. adjective

most curious or inquisitive, often in a nosy or intrusive manner

“She’s the sniffiest journalist in the city, always digging up scandals.”

3. superlative

extreme or most severe in quality or degree, especially with regard to smell

“The city’s air quality was the sniffiest in the country, causing widespread health problems.”