‘劲头’ (jìn tou) is a colloquial noun meaning enthusiasm, energy, or drive—the inner motivation that pushes someone to act with vigor and determination. The first character 劲 (jìn) means ‘strength’ or ‘effort’, while 头 (tou) is a common noun suffix indicating ‘aspect’, ‘quality’, or ‘state’—so literally, ‘the aspect of strength’. It emphasizes not just physical power but mental and emotional readiness to engage fully.

This word is often used to describe people’s attitude toward work, study, hobbies, or challenges—especially when they show sustained, spirited involvement. It carries a positive, informal tone and appears frequently in spoken Mandarin and casual writing. Unlike formal synonyms like 热情 (rèqíng), 劲头 highlights active, forward-moving energy rather than passive feeling. It’s rarely used in solemn or highly formal contexts, and never for abstract or impersonal forces (e.g., you wouldn’t say ‘the劲头 of the wind’).