#  A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  W  V  X  Y  Z

A security or an asset that can’t be easily and fast converted in cash (think real estate, de-listed shares, and collectibles).
Illiquid also refers to companies that can not meet its debt obligations or daily operational needs with current cash-flow.