The term INEXCITABLE can be broken down into four crossword solutions: ALOOF (5 letters), PLACID (6 letters), IMPASSIVE (9 letters), and SERENE (6 letters). ALOOF is defined as being distant or uninvolved in the affairs of others, while PLACID is defined as being calm, peaceful, and untroubled. IMPASSIVE is defined as showing no emotion or interest, and SERENE is defined as being peaceful, calm, and untroubled. Together, these words describe someone who is not easily excited or stirred up emotionally.