Synonyms of the word

inedible

• adj. not edible; not appropriate, worthy, or safe to eat.
• n. Anything inedible; that which is not a foodstuff.

indigestible

• adj. Difficult or impossible to digest.
• adj. (by extension) Difficult to accept; unpalatable.
• n. Anything that is difficult to digest.

poisonous

• adj. Containing sufficient poison to be dangerous.
• adj. (of an animal) Inedible due to containing poison; poisonous to eat.

tough

• adj. Strong and resilient; sturdy.
• adj. (of food) Difficult to cut or chew.
• adj. Rugged or physically hardy.
• adj. Stubborn.
• adj. (of weather etc) Harsh or severe.
• adj. Rowdy or rough.
• adj. (of questions, etc.) Difficult or demanding.
• adj. (material science) Undergoing plastic deformation before breaking.
• interj. (slang) Used to indicate lack of sympathy.
• n. A person who obtains things by force; a thug or bully.
• v. To endure.
• v. To toughen.

uneatable

• adj. Not eatable; not fit for eating.

unpalatable

• adj. unpleasant to the taste.
• adj. (by extension) unpleasant or disagreeable.