Felicitous

adj.thoughtful, joyfulformal

Meaning 1

Especially well chosen, suitable, or pleasing.

Reach for it when praising wording, timing, or a choice whose fit is unusually good

Her felicitous phrase captured the spirit of the celebration.

everyday
well chosen
plain praise for a selection is clearer
not when Well chosen lacks the elegance suggested by felicitous.
warm
graceful
ease and elegance are what impressed you
not when Graceful can describe movement without being especially suitable.
formal
apposite
a remark is precisely relevant
not when Apposite concerns relevance more than beauty or timing.
formal
apt
exact suitability is the whole point
not when Apt is cooler and does not convey grace or pleasure.

Pleasing or fortunate in effect.

Reach for it when describing a happy result created by circumstances or combination

A felicitous blend of shade and breeze made the courtyard inviting.

everyday
fortunate
good chance explains the pleasing outcome
not when Fortunate emphasizes luck rather than skillful fit.
formal
auspicious
the circumstance promises a favorable beginning
not when Auspicious points forward and may invoke omen.
formal
harmonious
parts combine pleasingly without conflict
not when Harmonious credits the fit, whereas felicitous may also credit good fortune.
literary
happy
a choice or coincidence proved especially successful
not when This sense of happy can be mistaken for emotion.

felicitous phrase
The translator found a felicitous phrase for the gentle joke.
felicitous choice
Blue stone was a felicitous choice for the shaded courtyard.
felicitous combination
The dish relies on a felicitous combination of citrus and herbs.

The definition and the example on this page are written here. The dictionaries above ground which meaning is being described, not the wording.