The word 疑犯 is formed by combining two characters: 疑 (yí), which means "to doubt" or "suspicion", and 犯 (fàn), which means "criminal" or "offender". It is a logical, condensed fusion where the first character describes the state (being under suspicion) and the second identifies the category of person (a perpetrator). Together, they create a single, efficient concept meaning "suspect" (a person suspected of a crime), building the meaning directly from the sum of its transparent parts.