A five letter word that is the opposite of the word "gradual" and contains a second letter of "l" is a popular word game answer. The five letter word being sought is "fleet."
There is no precise opposite, but laugh is a good possibility.
The usual antonym of narrower is "wider."
There are no five letter words starting with the two letters a and j
The opposite of "sweet" is "sour."
Event.
rapid Or possibly "steep."
A five letter word, second letter F is after or often.
Five letter words with the second and fourth letter O are:boronbosomcocoacoloncolordonorhonormoronmotorrobotrotor
A five letter word meaning the opposite of hurry would be dally. There may well be others
A five letter word for the opposite of lower is upper.
Some five letter words with the second and fifth letter O are:bongocondofolioforgolottomottopoliorodeotorso
night
plain
Sharp
awake
fresh
giant