Adam Smith Program
Dan Klein’s Vocabulary Aphorism
Let your vocabulary be a source of pride not for the words it competently includes but for the words it scrupulously excludes.
Sometimes a word remains outside a person's active vocabulary because she lacks the competence to include it, and sometimes because she has the competence to exclude it.
BTW, terms I exclude:
The exclusion is relatively absolute. In certain contexts I might say "utilitarians" to refer to a set of thinkers who describe themselves as “utilitarians." I might say ”postmodernism" to refer to the discourse of some set of authors who describe themselves as "postmodernist."
A term I do not exclude as strictly but try to avoid:
Karl Kraus: "My language is the common street prostitute that I turn into a virgin."
(That Kraus quotation is among those I have collected here.)