Use the word......... to describe an unclean, musty, and possibly moldy smell.

A smell that is only smelt briefly or faintly

the smell is so strong that you cannot smell or hear anything else.

very distinctive smell

unpleasant and makes you feel slightly sick, often because it is extremely sweet.

When people get sick they secrete different scents because their immune systems are in overdrive. This is typically emitted through bad breath, stinky urine, and sweat.

Unpleasantly sharp, pungent, or bitter to the taste or smell. Sharp, bitter, stinging, or irritating to the taste or smell.

 It is a sharp and bad smell. These scents make a person feel when they smell it. Examples include blue cheese, cigar smoke, fecal matter (e.g., manure), sweat, and sometimes, smells of onion and garlic. 

arousing the appetite: tantalizingly delicious or appealing aroma