Full Idea
Russell says the best chance of avoiding vagueness are the logical connectives. ...But the vagueness of 'true' and 'false' infects the logical connectives too. All words are vague. Russell concludes that all language is vague.
Gist of Idea
Logical connectives have the highest precision, yet are infected by the vagueness of true and false
Source
report of Bertrand Russell (Vagueness [1923]) by Timothy Williamson - Vagueness 2.4
Book Reference
Williamson,Timothy: 'Vagueness' [Routledge 1996], p.54
A Reaction
This relies on the logical connectives being defined semantically, in terms of T and F, but that is standard. Presumably the formal uninterpreted syntax is not vague.
Related Idea
Idea 21596 Vagueness undermines the stable references needed by logic [Williamson]