| noun | change toward something smaller or lower |
| noun | a condition inferior to an earlier condition; a gradual falling off from a better state |
| noun | a gradual decrease; as of stored charge or current |
| noun | a downward slope or bend |
| verb | grow worse “Conditions in the slum worsened” |
| verb | refuse to accept “He refused my offer of hospitality” |
| verb | show unwillingness towards “he declined to join the group on a hike” |
| verb | grow smaller “Interest in the project waned” |
| verb | go down “The roof declines here” |
| verb | go down in value “the stock market corrected” |
| verb | inflect for number, gender, case, etc., “in many languages, speakers decline nouns, pronouns, and adjectives” |
| decline | verb | grow smaller |
| diminish | verb | decrease in size, extent, or range |
| decay | verb | lose a stored charge, magnetic flux, or current |
| declivitous | adjective | sloping down rather steeply |
| fall | verb | slope downward |
| worsening | noun | process of changing to an inferior state |
| decline | noun | a condition inferior to an earlier condition; a gradual falling off from a better state |
| declension | noun | process of changing to an inferior state |
| declination | noun | a condition inferior to an earlier condition; a gradual falling off from a better state |
| refusal | noun | a message refusing to accept something that is offered |
| rejection | noun | the act of rejecting something |
| turndown | noun | the act of refusing an offer |
| wane | noun | a gradual decline (in size or strength or power or number) |
| waning | noun | a gradual decrease in magnitude or extent |