The phrase "is not explicit" is correct and usable in written English.
You can use it when something is not clearly stated or expressed. Example sentence: The rules of the game are not explicit.
"By today's standards it is all quite implicit, it is not explicit," said McCallum.
But the law is not explicit about what services must be included in that coverage.
"Close Window" is not explicit - I just got shut out and have to find my way back!
Right now, Fox's relationship to MySpace is not explicit, although Fox movies and television shows are frequent advertisers.
Even when the memory of a traumatic event is not explicit in a novel, it is implicit, Mr. O'Brien said.
(This purpose is not explicit, but it is the most likely explanation, in light of the current administration's deregulatory efforts). The four provisions are discussed below.
However this information is not explicit in the signal, the sound waveform that enters our ears is a composite of the individual sources in the world.
The opinion of the Court of Appeals is not explicit as respects the grounds for dismissing the complaint under 42 U.S.C. 1985, 42 U.S.C.A. § 1985.
In Britten's "Billy Budd" and "Death in Venice," he notes, while the homosexual undertone is clear, it is not explicit in the libretto.
A student of the fiction of Henry James, the ultimate sensor of unspoken implications, he is always detecting what is not explicit.
But this is not explicit in Mr. Treichel's poem, and the savage irony of nature perverted for the purpose of execution is understated.
