A slight lisp clued me in to the identity of the caller.

He spoke with a slight lisp that Garion found peculiar.

Her voice was dry and brittle, softened by a slight lisp.

He has a thick voice, a slight lisp and an appealing tendency to run off at the mouth.

He speaks with a sharp Brooklyn accent and a slight lisp.

'You will excuse my coming in, doctor,' said he to me, speaking English with a slight lisp.

He spoke with a slight lisp and he put his arms around her as if she were going to fall.

He talks with a sing-song voice and, after lunch usually, a slight lisp.

She had a slight lisp; it came out as mutht you?

Asked how often she had attended such events, the little blond girl with a slight lisp, said, "I've been to many."