The word "suspect" originates from the Latin verb 'suspectare', meaning "to look up at, mistrust," which is an intensive form of 'suspicere' (to look up at, admire, but also to mistrust). This Latin source is a compound of the prefix 'sub-' (meaning "from below, secretly") and the verb 'specere' (to look). The literal image is of looking up at someone from below, implying a watchful, wary, or mistrustful gaze. Over time, this concrete notion of looking at something with hidden doubt evolved into the modern abstract meanings of believing something to be likely without proof, or a person thought to be guilty. The semantic journey captures the shift from a physical act of secret observation to the mental state of suspicion.

Structure: sus (under, from below) + pect (look, observe) - sus: A prefix from Latin 'sub-', meaning "under, from below, secretly." - pect: A root from Latin 'specere' (to look at), via its frequentative form 'spectare'.