If you have a penchant for some activity, you have a strong fondness for it and thus find it enjoyable.
A propensity is a natural tendency towards a particular behavior.
If you are pensive, you are deeply thoughtful, often in a sad and/or serious way.
When you offer recompense to someone, you give them something, usually money, for the trouble or loss that you have caused them or as payment for their help.
An indispensable item is absolutely necessary or essential—it cannot be done without.
Something expensive costs a lot of money or has a high price.
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