- reconsideration, second thought, afterthought, rethink - thinking again about a choice previously made; "he had second thoughts about his purchase"
--1 is a kind of reversal, change of mind, flip-flop, turnabout, turnaround
- afterthought - an addition that was not included in the original plan; "the garage was an afterthought"
--2 is a kind of addition, add-on, improver