The word 'tigerishly' has one main antonym: calmly. While 'tigerishly' implies aggression, ferocity, and boldness, 'calmly' denotes a relaxed, composed, and peaceful demeanor. Other antonyms for 'tigerishly' may include meekly, timorously, apprehensively, and hesitantly. These words convey a sense of submissiveness, fearfulness, and shyness, which is a complete contrast to the boldness and fearlessness that 'tigerishly' implies. When choosing the appropriate antonym for 'tigerishly,' it is necessary to consider the specific context and the intended meaning of the sentence or phrase.