The most common and most likely answer to this crossword clue is the 12 letter word IMPERSONALLY
I've seen this crossword clue in The Sunday Telegraph
I
M
P
E
R
S
O
N
A
L
L
Y
Buddy explains!
The straight part
We know that "without human feelings" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case without human feelings = impersonally.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.