I've found in a critique of the play that the "scholar's shudder" is in reaction to "so ill-mixed a conjunction of Old English and Ancient Greek" by Miss Prism--so one can assume that it has to do with her misuse of language.
Can anywordnik tell me what this is? It's in the script of 'The Importance Of Being Earnest'. It's what the Rev Chasuble does before responding to Miss Prism saying ' . . A misanthrope I can understand - a womanthrope, never!'