implacable
The president claims the news media is implacably hostile to his initiatives.
The two countries have had an implacably hostile relationship.
He was implacably against attempts to introduce any element of power-sharing.

SMART Vocabulary: related words and phrases

Enlarging and inflating
augmentation
balloon
bloat
broaden
build (someone/something) up
bulk
expand
explosively
flare
fluff something up
inflation
lengthen
maximize
puff
pump someone up
reinflate
reinflation
scale something up
stretch
uninflated

You can also find related words, phrases, and synonyms in the topics:

Inevitable