In a manner difficult to understand

In an ambiguous manner | SYN: equivocally.

In a confused manner.

In a confusing manner, in a bewildering manner

In a dim indistinct manner | SYN: indistinctly.

Ambiguously, in a prevaricating manner; questionably, doubtfully

In an obscure manner.

In a vague way | SYN: mistily.