Delighted expresses a much higher degree of pleasure than glad. A person may be glad or delighted to see a friend, and gratified at the attention shown by his visits.

Webster's Revised Unabridged Dictionary (1913)

Example sentences

pleased All the orchestra were pleased with their success.
thrilled I thought that Tom would be thrilled to see Mary.
overjoyed I'm overjoyed my son has found such a nice girl.
charmed Everybody at the party was charmed with her grace.
enthralled The children were enthralled by the fairy tale.

Popularity over time

Word	1850 → 2019	Trend
delighted		steady
pleased		steady
thrilled		rising
overjoyed		rising
gratified		falling
charmed		rising

Use in printed books, per decade from 1850 to 2019.

By length

4 letters: glad¹, rapt¹
5 letters: happy², merry²
6 letters: joyful², joyous², elated³
7 letters: pleased¹, charmed¹, gleeful²
8 letters: thrilled¹, ecstatic³, euphoric³, jubilant³, exultant³, gladsome
9 letters: enchanted³, overjoyed³, gratified³, entranced²
10 letters: captivated⁴, enthralled²

The small number after each word is its number of syllables (happy² = 2 syllables).