unruffable

unruffable

(ʌnˈrʌfəbəl)
adj
implacable
References in classic literature ?
But people who go voluntarily to law, or are taken forcibly there, for the first time, may be allowed to labour under some temporary irritation and anxiety; and Sam, with a due allowance for the frailties of human nature, obeyed all his master's behests with that imperturbable good-humour and unruffable composure which formed one of his most striking and amiable characteristics.
THE normally unruffable Lord Jones of Birmingham (pictured) was left a little embarrassed with a high profile gaff in the House of Lords.
Usually unruffable, Joe was understandably swearing afterwards.