Espresso is definitely a strong coffee ??

Espresso Strong Coffee:  

The desire for strong coffee is communicated across cultures and elicits emotional responses related to strength, aggression, or a "go-get-'em attitude."

The definition of strong coffee is not based on physical characteristics, but on how it makes the drinker feel. It can have an intense and long-lasting flavour, a full and rounded body, and a thicker consistency.

Some people define strong coffee by its bitterness or caffeine content, while Italians prefer bitterness and Brazilians expect heavily roasted coffee.

There are various interpretations of what constitutes "strong coffee," with some using the term to describe a concentrated drink or a darker roast.