The phrase "more tigerish" implies ferocity and aggressiveness, but there are several antonyms that suggest the opposite. For example, "docile," "gentle," "meek," "timid," "submissive," or "tame" are all adjectives that convey a lack of aggression. Moreover, "shy," "reserved," "calm," and "peaceful" can describe the opposite of tigerish as well. Other antonyms might include "yielding," "placid," and "compliant." To sum it up, if a person is seeking an antonym for "more tigerish," there are several options to choose from, all of which describe a more subdued and passive demeanor.