undefinable

adj.not capable of being precisely or readily described; not easily put into words

同义词：indefinable

Undefinable
Undefinable
Causality is undefinable - toward a theory of hierarchical definability
The Word Game: The Ontology of an Undefinable Object
Masculinity and femininity: Defining the undefinable
Domains of undefinable solutions of some equations and systems of difference equations
"The rate of aging": a counterproductively undefinable term
Mapping the Undefinable: Some Thoughts on the Relevance of Exchange Programs within International Relations Theory
Defining the Undefinable: Good Faith and the United Nations Convention on the Contracts for the International Sale of Goods
Tacit knowledge and the economic geography of context, or The undefinable tacitness of being (there)