Depending on the episode, the profanity can range from "hell", to "bitch" (although, fuck and shit have been implied in a handful of episodes primarily for shock humor, there's never been an uncensored use of these words).
Comments are used such as "slut", "butthead", etc.
Very rare uses of "dick" in a non-sexual way in 2 episodes throughout Season 25.
In one episode, when Homer swears at some point, he puts money in a "swear jar".
Most episodes have moderate language some more then other, "bitch" and "bastard" may be the strongest terms used in the entire series.
"Fuck" and "shit" are present in the series but it's extremely rare and is always either bleeped out or censored in some way when said, even on streaming and home media releases.
The phrases "Shove it," "Get bent," and "Eat my shorts" are heard.
Mild to Moderate language in the series. In most episodes, very mild words such as "hell", and "damn" are frequent, but occasional used. Infrequent uses of "crap", "piss", "ass", "bitch", and "bastard". Rarely uses of "balls", "slut", and "dick". Frequent uses of religious exclamation in the below.
"I Swear To God", "Oh My God", "Good Lord", etc.
In the episode "Midnight Towboy", Bart says " Shut the hell up, you damn ass whore".
In one episode, Homer calls Marge an "intergalactic hussy."
Strong language is present but it's either bleeped or censored in some way and it's extremely rare.
Some characters refer to some people as nobodies, which may be bizarre or shocking to some people.
One uncensored use of faggot.
Bart catchphrase are "I'm Bart Simpson. Who the hell are you?" whenever anyone ask his name is, and a iconic catchphrase "Eat my shorts" when he get in various funny situations.
Comedic swearing.
High school/Adult school rude humor.
In the 26 season episode, "The Wreck of the Relationship", there is an instance where we see a character stick up her middle finger towards the camera. It's blurred on TV broadcasts and on the Disney+ version but was uncensored on select platforms. The uncensored version received a TV-MA rating.
Infrequent uses of British foul language, such as "bloody", "bollock", and "wank/wanker".
Somewhat frequent mild to moderate coarse language is used including words like "hell", "damn", "crap", "bloody" and "god" being used pretty frequently. "ass", "bastard", "piss" and "bollocks" are used sometimes. "bitch", "whore", "wanker" and "skank" are used pretty infrequently. "slut", "dick" and "balls" are used rarely. One episode contains a (pixelated) middle finger.
The worst uncensored word is Bitch. Anything more offensive is bleeped.
Bart laughed at the word retardant in one episode as it sounds like another word.
"Suck," "god," "crap," "piss," "hell," "dammit," "ass," "bitch," "bastard," "balls," "wanker," "whore," "slut," "dick," "skank," and one notable uncensored use of "shite" in the episode "Fraudcast News" respectively. All instances of stronger coarse language (including "shit") are bleeped, though most of the time the bleeps are for a joke and not actually for censoring these words. One of their characters uses the word "faggot" in one episode, but it is not used as an insult.
Words like "hell" or "damn" are frequent.
The show also contains infrequent uses of derogatory terms against minority groups in some episodes.
Some audio commentaries or deleted scenes in some of the complete season home video releases may contain uncensored uses of the words "fuck" or "shit".