#show not tell
Show not tell “Happy”:
▪️Her cheeks glowed pink.
▪️He smiled, his brown eyes sparkling.
▪️She skipped across the room, humming a love song.
▪️He laid down with an amused smile on his face.
▪️Her hands clasped together and she squealed.
▪️She laughed, falling into the chair and holding her stomach.
▪️She jumped to her feet and cheered them on.
▪️She danced around her room, grinning wide.
▪️Her eyes teared with joy at the sight of her missing daughter.
▪️She wiggled her feet in the sheets, a soft sigh on her lips.
▪️Warm goosebumps broke out on her skin as she stared into his wonderful eyes.
▪️She waved her hands from side to side, twirling.
Notice that I’m not describing happy with “happy” synonyms: 
▪️She was ecstatic.
▪️She felt joyful.
▪️She looked cheery.
This is still telling and your readers won’t get the picture you’re trying to paint.
Example:
She felt so cheery and joyful. ✖️
Vs.
Her cheeks hurt from smiling as she skipped from the room, daydreaming and singing a love song. ✔️