Unflappably is an adjective that describes someone who remains calm in the face of adversity. Some synonyms for unflappably include unshakeable, composed, collected, coolheaded, imperturbable, unruffled, serene, unflustered, and equanimous. Each of these words implies a level of control and poise in stressful situations. While unflappably suggests an ability to remain unfazed in any circumstance, these synonyms offer a range of nuances. For example, unshakeable emphasizes steadfastness, while imperturbable suggests an unbothered attitude. No matter which word you choose to use, each provides a fitting description of someone who exudes an unwavering sense of calmness even in the most challenging situations.