(of a person) not able or willing to show feelings or take part (because nervous, arrogant etc)

remote

(happy because) free from anxiety

light-hearted, untroubled

(of a person) not favouring a particular side, opinion etc (in a quarrel)

unfeeling, impartial

kind, friendly; not rough or violent; gradual

having a mild or kind nature

(of words, ways of speaking or writing) used in situations when one can be friendly and relaxed

casual, simple