adverb taking the 'to' particle imperturbable, sereno, tranquilo, inalterable, que siempre mantiene la calma, que tiene mucha sangre fría

adverb taking the 'to' particle yojijukugo having presence of mind;self-possessed;imperturbable;calm and self-possessed

adjectival nouns or quasi-adjectives (keiyodoshi) self-possessed;composed