The phrase "clunky combat" refers to a fighting system in a video game or other form of entertainment that feels awkward, slow, or unresponsive. Full definition
You see, this happens on nearly every occasion when five or more characters / creatures try to attack you, making the already clunky combat system even worse. (thexboxhub.com)
The extremely clunky combat system is an absolute game killer for me. (metacritic.com)
Freedom Unite is certainly no exception, with clunky combat manoeuvres and esoteric gameplay explanations overshadowing some of the game's truly beautiful aspects. (cubedgamers.com)