Fragrant means smelling pleasant, so some suggestions for opposites are:
fetid
foul-smelling
malodorous
rank
smelly
stinking
The opposite of 'stinky' (bad smelling) is most likely aromatic, perfumed, or fragrant.
Smelly, Reeking, Foul, Malodorous, Putrid & Fetid
The superlative form of the word "fragrant" is "most fragrant."
The typical form is "more fragrant."
Fragrant is an adjective.
The flower garden is most fragrant in the spring. A fragrant scent came from the burning incense.
Fragrant Concubine was born in 1734.
Fragrant Harbour was created in 2002.
Fragrant Sense was created in 1999.
Fragrant Concubine died in 1788.
Fragrant is and adjective. Fragrantly is an adverb.
The rose garden was very fragrant, as the sun warmed it.