uncool

adjectives

(spoken slang) unfashionable and boring
is similar to
having undesirable or negative qualities
"a bad report card"; "his sloppy appearance made a bad impression"; "a bad little boy"; "clothes in bad shape"; "a bad cut"; "bad luck"; "the news was very bad"; "the reviews were bad"; "the pay is bad"; "it was a bad light for reading"; "the movie was a bad choice"
domain usage
a characteristic language of a particular group (as among thieves)
"they don't speak our lingo"