I´ve heard of the expression "weak constitution", it means you have a weak stomach. The right translation for "complexión" es "constitution" and I also found "build" as a noun, meaning "complexión" too. I haven´t found anything about the adjectives that can precede the noun.
Could anybody help me with this? I want to refer to a person apparently short, slim, weak... "de complexión delgada" in Spanish. I don't know the term in English.
Thanks in advance.