a painting or other work of art executed directly on a wall

A palindrome is a word, phrase, or sequence that reads the same backward as forward.

a sudden powerful forward or upward movement, especially by a crowd or by a natural force such as the waves or tide.

A synonym of perky is....

to talk or utter foolishly; babble:

any payment extorted by intimidation, as by threats of injurious revelations or accusations

following one another in uninterrupted succession or order; successive:

not having the normal or natural shape or form

concentrated on a single area or subject or in a short time; very thorough or vigorous

to change (as a secret message) from code into ordinary language

an intermittent and remittent fever caused by a protozoan parasite that invades the red blood cells. The parasite is transmitted by mosquitoes in many tropical and subtropical regions