RichThesaurus
pencil-necked
vs
tenuous
pencil-necked
adj
Insubstantial; weak.
Having a very thin neck.
tenuous
adj
Thin in substance or consistency.
Insubstantial.
How often have the words
pencil-necked
and
tenuous
occurred in a corpus of books?
(source:
Google Ngram Viewer
)