Super means extremely good, said informally. That's super, a super idea, super pleased.
As an adjective it is dated and cheerful; as an intensifier before another adjective — super pleased, super careful — it is recent and everywhere. It began as a prefix meaning above, which is still its main job in supermarket, supervise and superb. Note that the Latin super simply means above.
1adjectivesuperExtremely good, said informally.
“We had a super time at the seaside, so thanks for inviting us!”
2adverbadjectiveVery, before another adjective.
“The new phone is super thin and super fast.”
Too few real examples of this word to estimate which sense is commonest.
super is an intensifier.
Latin super means above. The English word is the prefix used on its own, from the nineteenth century.
Latin
super-
Middle English
super-
English, today
super
Built from
From super-, from Middle English super-, from Latin super-, from super (“above”). a doublet of over and hyper.
Etymology from Wiktionary, CC BY-SA