Webster's English Dictionary

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inconstant

in.con.stant \-st*nt\ aj [ME, fr. MF, fr. L inconstant-, inconstans, fr. 
   in- + cons]tant-, constans constant : likely to change frequently without 
   apparent or cogent reason INCONSTANT implies an incapacity for steadiness 
   and an inherent tendency to change; FICKLE suggests unreliability because 
   of perverse changeability and incapacity for steadfastness; CAPRICIOUS 
   suggests motivation by sudden whim or fancy and stresses unpredictability; 
   MERCURIAL implies a rapid changeability in mood esp. from depression to 
   elation; UNSTABLE implies an incapacity for remaining in a fixed position 
   or steady course and applies esp. to a lack of emotional balance - 
   in.con.stant.ly av SYN syn FICKLE, CAPRICIOUS, MERCURIAL, UNSTABLE: