in‧con‧sis‧ten‧cy plural inconsistencies
when someone keeps changing their behaviour, reactions etc so that other people become confused [≠ consistency]
2 [uncountable and countable]
a situation in which two statements are different and cannot both be true [= contradiction]:
There were several glaring inconsistencies (=very noticeable differences) in his report.
Defence counsel looks for inconsistency between witness statements.