The phrase "abundant reason" is correct and usable in written English.
It can be used to indicate that there is a plentiful or ample justification for something.
Example: "There is abundant reason to believe that the new policy will improve employee satisfaction."
Alternatives: "plenty of justification" or "ample reason".
They had abundant reason.
This was an assault on something about which for so long there has been abundant reason to believe is the most secure psyche in any branch of professional sport.
"We've learned from the disclosures regarding Zacarias Moussaoui, the so-called 20th hijacker, that even though the F.B.I. had abundant reason to be suspicious of him before 9/11, it didn't act," Mr. Schumer said today at the hearing of the Senate Select Committee on Intelligence.
Howard Dean, the chairman of the Democratic National Committee, said in a statement that while "it is not surprising that Karl Rove was demoted this morning," Mr. Rove's involvement in the C.I.A. leak case still gave the president "abundant reason" to fire him.
"There is abundant reason why every State should make ample provision, not only for the proper custody, but also for the most enlightened treatment of all the insane within its borders," Kirkbride wrote in his influential 1854 work On the Construction, Organization, and General Arrangements of Hospitals for the Insane.
Until recently, Chinese people had abundant reasons not to roam for pleasure.
Both have great faith in their missing lovers, despite abundant reasons to feel otherwise.
The court found abundant reasons, six in number, for refusing to sustain the title thus obtained.
Shin has had abundant reasons to smile for the past two years, because she has perhaps been in contention more, and responded better, than any touring professional in the world.
Still, even with the margin suggested by this poll -- which would be considered wide by the standard of recent New York elections -- the results suggest abundant reasons for concern by Mrs. Clinton and hope for Mr. Lazio as they enter the last eight days of their contest.
Levi had abundant reasons to proceed warily.
