Related Clues:
- Speak haltingly
- Say 'thay,' e.g.
- Emulate Sylvester J. Pussycat
- Fail to sibilate
- Imperfect speech
- Thylvethster's thpeech problem
- Slip of the tongue, maybe
- Daffy Duck trademark
- One could make sin thin
- Speaker's problem
- Daffy Duck trait
- Lingual protrusion result
- Sylves-ter's impediment
- What Karloff and Sylvester have in common
- Have trouble with dismissals?