All 4 Uses

felicity
in
Middlemarch
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Dorothea's faith supplied all that Mr. Casaubon's words seemed to leave unsaid: what believer sees a disturbing omission or infelicity?†
Chpt 1 *

infelicity = awkwardness or inappropriateness; or an instance of such

standard prefix: The prefix "in-" in infelicity means not and reverses the meaning of felicity. This is the same pattern you see in words like invisible, incomplete, and insecure.
It expressed regrets and proposed remedies, which, when Mr. Brooke read them, seemed felicitously worded—surprisingly the right thing, and determined a sequel which he had never before thought of.†
Chpt 3
The felicitous word "demise," which had seasonably occurred to him, had raised his spirits even above their usual evening pitch.†
Chpt 3

Uses with a meaning too rare to warrant foucs:

By-and-by Celia would come in her quality of bridesmaid as well as sister, and through the next weeks there would be wedding visits received and given; all in continuance of that transitional life understood to correspond with the excitement of bridal felicity, and keeping up the sense of busy ineffectiveness, as of a dream which the dreamer begins to suspect.†
Chpt 3 *

Definitions:

(1) (felicity as in: domestic felicity)
happiness or luck; or an instance or source of such
(2) (felicity as in: felicity of expression)
pleasing and appropriate manner or style; or an instance of such
(3) (meaning too rare to warrant focus)
Less commonly, Felicity is the first name of a female.