Adjectives

(a)collected, gatheredbrought together in one place“the collected works of Milton”, “the gathered folds of the skirt”
(s)collected, equanimous, poised, self-collected, self-contained, self-possessedin full control of your faculties“the witness remained collected throughout the cross-examination”, “perfectly poised and sure of himself”, “more self-contained and more dependable than many of the early frontiersmen”, “strong and self-possessed in the face of trouble”