Lovestruck

adj.joyful, kindplayful

What it means

So absorbed in romantic love that the feeling visibly shapes one's mood or behavior.

Reach for it when describing delighted romantic infatuation with affectionate, usually lighthearted emphasis

The lovestruck pair missed their stop because they were still trading stories.

playful
head-over-heels
informal language suits total romantic absorption
not when The idiom is emphatic and inappropriate for uncertain or private feelings.
warm
adoring
open tender devotion is the observable quality
not when Adoring suggests sustained affection and not necessarily the disorientation of new love.
warm
smitten
sudden strong affection has an endearing tone
not when Smitten is broad enough for admiration of a place or idea.
professional
infatuated
intense attraction may be idealized or short-lived
not when Infatuated is more clinical and less joyful than lovestruck.
formal
enamored
strong fondness is expressed with some restraint
not when Enamored can apply to objects and lacks the visibly dazzled effect.
literary
besotted
infatuation overwhelms ordinary judgment
not when Besotted often sounds mocking or suggests foolish excess.
literary
starry-eyed
romantic hope is idealistic and dreamy
not when Starry-eyed can imply naivety rather than mutual love.

lovestruck couple
The lovestruck couple wrote each other notes during the delayed flight.
lovestruck smile
A lovestruck smile appeared whenever her name was mentioned.
look lovestruck
They looked lovestruck but still remembered to thank the patient waiter.

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