
masslos
excessive
To an extreme or exaggerated extent; without any moderation or limit.
Sein massloser Konsum führte schnell zu hohen Schulden.
His excessive consumption quickly led to high debts.
excessive
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excessive
To an extreme or exaggerated extent; without any moderation or limit.
Sein massloser Konsum führte schnell zu hohen Schulden.
His excessive consumption quickly led to high debts.

boundless
To a very high, almost immeasurable degree, often in relation to feelings such as disappointment or anger.
Nach der ungerechten Entscheidung war ihre Enttäuschung masslos.
After the unfair decision, her disappointment was boundless.
The word is made up of 'Maß' (measure) and the ending '-los' (-less). The ending '-los' means 'without', so 'maßlos' literally means 'without measure'.
Ihre Erwartungen an das Projekt waren maßlos übertrieben.
Her expectations for the project were excessively exaggerated.
'Maßlos' is very often used as an adverb to intensify another adjective or a verb. It then means 'extremely' or 'very strongly'.
Nach der Absage war er maßlos enttäuscht.
After the cancellation, he was extremely disappointed.
In the meaning of 'übertrieben' (exaggerated), 'maßlos' is often combined with negative behaviors or qualities. Typical examples are 'maßloser Ehrgeiz' (excessive ambition), 'maßlose Gier' (excessive greed), or 'maßlose Verschwendung' (excessive wastefulness).
Seine maßlose Gier nach Macht hat ihn isoliert.
His excessive greed for power isolated him.
When it comes to feelings, 'maßlos' describes their extreme intensity. Common combinations are 'maßlose Wut' (boundless anger), 'maßlose Trauer' (boundless grief), or 'maßlose Freude' (boundless joy).
Als sie die Nachricht hörte, empfand sie eine maßlose Wut.
When she heard the news, she felt boundless anger.
boundless / limitless
Grenzenlos and masslos can express a very strong degree of emotion. Grenzenlos presents the feeling figuratively as completely without limits. Masslos, by contrast, emphasizes its extreme or exaggerated extent and therefore the lack of moderation.

Wegen der kleinen Verzögerung war seine Enttäuschung masslos.
His disappointment was excessive because of the minor delay.
Nach dem endgültigen Scheitern war seine Enttäuschung grenzenlos.
After the final failure, his disappointment was boundless.