1.Definition: great in vertical dimension; high in stature

"Tall people", "Tall buildings", "Tall trees", "Tall ships"

2.Definition: impressively difficult

"A tall order"

3.Definition: lofty in style

"He engages in so much tall talk, one never really realizes what he is saying"

Related Adjective(s):grandiloquent, magniloquent

4.Definition: too improbable to admit of belief

"A tall story"

Related Adjective(s):improbable, marvellous, marvelous