chasm
major decision
nadir
lowest point
nugatory
worthless, useless, of little value
paltry
practically worthless, trashy
paramount
above others, supreme
callow
young and inexperienced
defunct
dead, extinct
inveterate
firmly established by age, deeply rooted, habitual
obsolescent
becoming out of date
primordial
existing at the very beginning of human time
puerile
childish for an adult
venerable
worthy of respect due to an advanced age
slatternly
untidy, dirty from neglect