[verb ます-stem] + 放題
Note: Most commonly forms compound nouns (e.g., 食べ放題). Often used as a な-adjective or noun modifier.
放題 (ほうだい) attaches to verb stems to express the idea of doing something as much as one wants, without restraint or limit. It conveys that there is no restriction on the action – either because it is permitted (as in a service or offer) or because things are left unchecked in a negative sense.
The most common and familiar use of 放題 is in set phrases describing services where you can do something without limit for a fixed price or time. In this usage, the verb stem directly precedes 放題.
Common fixed expressions include たべほうだい食べ放題 (all-you-can-eat), のみほうだい飲み放題 (all-you-can-drink), and とりほうだい取り放題 (pick as many as you want).
放題 can also carry a negative nuance, meaning that something is done without care or restraint, or that a situation is left in an uncontrolled state. In this usage, it often pairs with verbs like ゆう言う, やる, ちらかす散らかす, etc.
Note how the pattern V[たい] + 放題 (e.g. いいたい言いたいほうだい放題, やりたいほうだいやりたい放題) is used to emphasize that someone acts entirely on their own desires without restraint. This pattern carries a strongly critical or disapproving tone.
V[stem] + 放題 (e.g. 食べ放題, 飲み放題): Neutral – describes an allowed or offered situation of unlimited action.
V[たい] + 放題 (e.g. 言いたい放題, やりたい放題): Negative – describes someone acting selfishly or without regard for others.
放題 functions as a noun/na-adjective and can modify other nouns with の or be used predicatively with だ/です.