Adjective

1. aloof, distant, upstage, reserved (vs. unreserved)

usage: remote in manner; "stood apart with aloof dignity"; "a distant smile"; "he was upstage with strangers"

Adverb

1. aloof

usage: in an aloof manner; "the local gentry and professional classes had held aloof for the school had accepted their sons readily enough"

See also: aloof (Dictionary)