someone who keeps doing something stubbornly or firmly even if it is difficult
Back
smirk
Front
to smile in a irritatingly smug or conceited way
Back
decrepit
Front
worn out or in bed condition because its old or has not been taken care of.
Back
defeated
Front
to lose in a contest or game to feel like you have lost or have no hope of winning
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inseparable
Front
people or things that can't be separated or pulled apart its like they're glued together usually this word applies to people and is a bit of an exaggeration