• well-tbumbed,
• well-thumned,
• well-thumbded,
• well-thumbedd,
• well-thumbbed,
• wel thumbd,
• wel thummed,
• weel thumbed,
• well thumbeded,
• well thummbd

The adjective form of the phrase "well thumbed" is "dog-eared".

The plural form of "well thumbed" is "well thumbed". The term "well thumbed" is typically used as an adjective to describe books or pages that have been used extensively or have been turned over many times. It does not change when used in the plural form.

The singular form of the word "well thumbed" is "well thumbed" itself. This phrase refers to a book or document that has been used extensively, with the pages showing signs of wear and handling. Since it describes a specific object, it remains the same in both singular and plural form.