尽きせぬ

つきせぬ

Pre-noun adjectival (rentaishi)

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一言に尽きるひとことにつきる

to sum it up in one word; ... is the word for it

精が尽きるせいがつきる

to be exhausted; to be out of energy

刀折れ矢尽きるかたなおれやつきる

to exhaust all one's options

愛想が尽きるあいそがつきる

to be disgusted with; to be fed up with; to run out of patience with

燃え尽きるもえつきる

to burn out