不 - negative, non-, bad

unhappiness; sorrow; misfortune; disaster; accident

irrational; illogical; unreasonable; absurd; inconsistent

everlasting; immortal; eternal; enduring; undying; imperishable

unclean; dirty; unsanitary; filthy

insufficient; inadequate; imperfect

impure; adulterated; foul; mixed; dishonest

missing (of a person); lost; unaccounted for; whereabouts unknown

clumsy; awkward; unskillful

imbalance; lack of balance; lopsidedness; disproportion; inequality; disparity

economic slump; hard times; depression; recession

discomfort; inconvenience

invulnerability; immortality; insensibility to pain