Flame-coloured is a word that describes a bright and fiery shade of orange, yellow or red. Antonyms for flame-coloured would include words that describe cooler, softer or darker shades. Some examples include words like "icy," "cool," "ashen," "shadowy," "midnight," "black," and "purple." These words might evoke feelings of calmness, peacefulness, and serenity, as opposed to the fiery, intense energy of flame-coloured hues. Using opposite words can create a sense of contrast and drama, which can be effective in conveying different moods and emotions in literature, art, and design.