尽 is an old way to say the end of the month; nowadays 月末 is more common.
unreasonable; irrational; outrageous; absurd
efforts; exertion; assistance
round-up; wholesale arrest; catching all at once
inexhaustible; endless · mutual financing association
withering; decay; decline
rich person; millionaire; magnate · big spender; debauchee
loyalty; devotion
terminating decimal; finite decimal
all day long · last day of the month; last day of the year; New Year's Eve
annihilation; total destruction
devoting oneself entirely; giving one's all
complete burning; burning down; incineration
squander; exhaust; use up completely
suicide
Abbreviation of 尽日 (じんじつ), literally 'exhaust day', referring to the day that finishes the month.