Green’s Dictionary of Slang

immense adj.

extremely good, first-rate, splendid.

[UK]Gent.’s Mag. 86/2: Here’s cream — damn’d fine — immense — upon my word!
[UK]G. Stevens ‘Time Killers’ in Songs Comic and Satyrical 216: Dear Bragg, Hazard, Loo, and Quadrille, / Delightful! extatic! immense!
[UK]Fast Man 7:1 n.p.: [T]he fun they had, take it all in all, [was] immense.
[US]Cincinnati Enquirer 7 Sept. 10/7: Immense – Any thing or any body that is good is immense, as well as a big house or a large person.
[Aus]Bulletin (Sydney) 7 Feb. 6/1: Tottles’ assumption of refined elegance, with a sort of lardidaism is ‘immence,’ [sic] but nothing can exceed his reproof of Bung for his vulgarisms and mispronunciation.
[UK] ‘’Arry on Equality’ in Punch 22 Feb. 85/2: When Science and Saintship shake hands, in a sperret of sound common sense, / To chuck over the cant of the Pulpit, by Jingo, old pal, it’s Himmense!
[UK]H.J. Sayers [perf. Lottie Collins] Ta-ra-ra Boom-de-ay [lyrics] Pa says that I have no sense / [...] But men say that I’m just immense.
[US]B. Fisher A. Mutt in Blackbeard Compilation (1977) 54: ‘Now the boobyhatch have formed a reception club called “Daffy with dormant domes” and —’ ‘Immense, general.’.
[US]Van Loan ‘The Mexican Marvel’ in Lucky Seventh (2004) 189: Bo, you’re immense! Immense!
[US]H.C. Witwer Fighting Blood 112: That bathrobe is immense.
[US]D. Runyon ‘Madame La Gimp’ in Runyon on Broadway (1954) 249: The old judge looks immense in his swallowtail coat.