The word Poltroonish is a term used to describe someone who is cowardly, timid, or lacking bravery. It may be difficult to find antonyms for this word since it is such a specific term. However, some possible antonyms for Poltroonish include courageous, bold, daring, fearless, and valiant. These words describe individuals who are willing to face challenges and overcome fear, in contrast to the lacking courage and timidity associated with Poltroonish. Additionally, words such as heroic, gallant, and intrepid also indicate bravery and valor, making them suitable antonyms to this somewhat uncommon word.