one day

dull, spiritless / inactive / stagnant

dullness, spiritlessness / inactivity / stagnation

astronomical (relating to astronomy) / astronomical (vast)

astronomer

instruction manual / explanation paper

stairs used in emergencies

state of emergency (unusually difficult or dangerous situation)

one, 1 / the first in order, foremost / the beginning / the best / a kind of; one of something / (card games) an ace / unity / the bottom string of a shamisen or other Japanese musical instrument

each person