be, look, seem, sound | become

enormously, especially, exceedingly, exceptionally, extraordinarily, extremely, highly, hugely, immensely, incredibly, infinitely, particularly, very
This is a highly complex matter.

increasingly | fairly, quite, rather, relatively, somewhat | surprisingly | unnecessarily | technically
technically complex surgery

huge, large, vast | conference, entertainment, factory, holiday, hospital, housing, industrial, leisure, museum, office, shopping, sports

build

real, terrible | inferiority, superiority | castration, guilt, Oedipus, persecution

have, suffer from | develop, get
Don''t keep on at him about his handwriting or he''ll get a complex.

give sb

~ about
She has a complex about her big ears.