Do these words work in the sentences correctly?

I need to use the following words in definitive sentences…could you guys help me edit them to make them grammatically correct? THANKS!

Altruistic: The altruistic deed that the lady did for the food bank was greatly appreciated by the homeless.

Clandestine: My best friend and I met at a clandestine meeting-place in the dark alley to discuss our evil plans to conquer the world.

Deprecate: Many elementary teachers have the tendency to deprecate to their students, by stooping low, and talking in a childish voice.

Incipient: Our incipient plans to conquer the world are beginning to fall into place.

Perfunctory: The boss gave such a perfunctory examination of our workspaces, that he never noticed the half played chess game in the corner of the room.