unaffectionate
He refers to his wife unaffectionately as "She who must be obeyed".
She speaks most unaffectionately about her home town.
The industrial cities in the region are often referred to unaffectionately as the Rust Belt.
The regulatory body is known unaffectionately as "Gums" because it is widely perceived to be toothless.

SMART Vocabulary: related words and phrases

Not showing or feeling emotions
anodyne
anti-sentimental
belie
bite
bite your lipidiom
frozenly
glaze
hard-bitten
hardened
icily
phlegmatically
poker face
reserved
reservedly
sphinx-like
unmoved
unprocessed
unresponsive
unresponsively
unresponsiveness