Add some more words to your pocket to use at times when needed the most.

someone living in isolation- Recluse
He is living a life of a recluse after his retirement.

behaving in a way as if giving tit for tat- Retaliate
People are trying to retaliate against growing corruption through this mass protest.

someone who spends money recklessly- Spendthrift
Don’t trust him with your money; he is a spendthrift.

a bride’s outfit- Trousseau
We need to buy her a splendid trousseau to match to her personality.