
gnadenlos
merciless
Without mercy, pity, or compassion; very harsh and unyielding.
Der Diktator verfolgte seine Gegner gnadenlos.
The dictator mercilessly persecuted his opponents.
merciless / extremely
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merciless
Without mercy, pity, or compassion; very harsh and unyielding.
Der Diktator verfolgte seine Gegner gnadenlos.
The dictator mercilessly persecuted his opponents.

extremely
Used colloquially as an intensifier meaning 'extremely' or 'completely', often with a negative connotation.
Der Film war gnadenlos langweilig.
The film was extremely boring.
The word is made up of 'Gnade' (mercy) and the ending '-los' (-less), which means 'without'. So 'gnadenlos' (merciless) literally means 'without mercy'.
Die Mannschaft war ihrem Gegner gnadenlos überlegen.
The team was mercilessly superior to its opponent.
In colloquial language, 'gnadenlos' (extremely) is often used as an intensifying word for adjectives, similar to 'extrem' (extremely) or 'total' (totally). It usually has a negative or ironic tone.
Die Preise in diesem Restaurant sind gnadenlos hoch.
The prices in this restaurant are extremely high.
In its main meaning, 'gnadenlos' (merciless) is often used as an adverb to describe an unyielding action. Typical verbs are 'ausnutzen' (to exploit), 'zuschlagen' (to strike), or 'durchsetzen' (to enforce).
Er hat die Situation gnadenlos ausgenutzt.
He mercilessly exploited the situation.
extreme
Both words can intensify a very strong, negative statement. „Extrem“ describes the high degree in a largely neutral way, while „gnadenlos“ also conveys a negative or ruthless judgment. Use „extrem“ when you mean only the intensity, and „gnadenlos“ when the harshness comes across as especially critical.

Der Wettbewerb war gnadenlos hart.
The competition was brutally tough.
Der Wettbewerb war extrem hart.
The competition was extremely tough.