物足りない
ものたりない · monotarinai · JLPT N1 · i-adj
unsatisfied
🍽️ 物 (thing) + 足り (be enough) + ない (not) = not enough stuff: unsatisfied
物 here means stuff or things, so the word literally says the things are not enough. Use it for a meal that leaves you still hungry, or a film that ends too soon.
足 — top 口 (mouth/enclosure) + bottom 止 (foot)
Originally a pictograph of a leg and foot, with the upper square representing the knee or shin and the lower part 止 depicting the foot itself. It primarily means 'foot' and by extension 'sufficient' or 'enough,' a meaning shift likely from the idea of standing firmly or having a solid footing.