RichThesaurus
ill-thought-out
vs
spur-of-the-moment
ill-thought-out
adj
Not considered carefully enough.
spur-of-the-moment
adj
Spontaneous; impromptu.
How often have the words
ill-thought-out
and
spur-of-the-moment
occurred in a corpus of books?
(source:
Google Ngram Viewer
)