This is the 10205th most frequent Japanese word.
間接
Indirect.
'間接的に得た' indicates that the describing of obtaining information was not done directly but via secondary means.
その情報を間接的に得た。
I obtained that information indirectly.
'間接話法' refers to a grammatical term 'reported speech', highlighting a way of expressing someone's words or expressions indirectly.
彼は間接話法を使った。
He used indirect speech.
Here, '間接的に' (indirectly) is used as an adverb to describe the manner in which the action was performed.