Usage patterns
〈事〉が不十分だX is insufficient/inadequate
The explanation at the meeting was inadequate.
不十分な〈物〉insufficient X (modifying a noun)
We lost the match due to insufficient preparation.
〈事〉が不十分なためbecause X is insufficient
The plan was cancelled because the funding was insufficient.
〈事〉を不十分なままにするto leave X insufficiently addressed
Leaving the explanation incomplete invites misunderstanding.
