(1) slip up
Don't slip up on this opportunity!
If he is sly, he will never slip up during this time.

(2) confidential
If you wish to disclose confidential information to a company in....
He submitted a confidential request to the undersecretary, and....

(3) solitary
As a solitary traveler, he began to discover who he was and what he stood for.
You live in the city but long to live in a solitary land where....
Then as a punishment I was placed in a solitary cell.

(4) so-called
Why I won't buy a so-called "cost efficient" computer
Japanese-English pronunciation, or so called Katakana English

(5) out of place
I thought these were a bit out of place for this book's theme because....
I began to feel unmistakably out of place in that pleasant family circle.

(6) ebullient
sailors and children are ebullient over the vernal season
David was quite ebullient about the whole thing

(7) pessimistic
So, we need not feel too pessimistic about our ability to tackle the issues.
the poem is neither pessimistic nor optimistic but states the simple fact...

(8) adage
It is an old adage that applies to my life.
The old adage "truth is stranger than fiction" applies here, though...

(9) reprove
Mothers reproved children for their weakness and...
suddenly our teacher reproved all male class mates because of..
He came to reprove and He came to bless

(10) dark
They storm through the streets violently into the dark night.
She conveys a dark view of humanity through her poetry.
but it always gave me a dark feeling