ingenious
So you fitted that wire through that little hole there: that's very ingenious!
instantaneous
She accidentally swallowed this poison and death was instantaneous.
integral
The form, the sound and the grammar rules are integral parts of a language.
intelligible
He used so many archaisms in his speech that half of it was barely intelligible.
jeopardize
The security of the whole operation has been jeopardized by one careless person.
lawsuit
A bad compromise is better than a good lawsuit.
linger
She lingered after the concert, hoping to meet the star.