The phrase "monotonous diet" means eating the same kind of food over and over again, which can become boring and lacking variety.
Sentences with «monotonous diet»
The truth, of course, is that the Rice Diet is only one more example of the unrealistic monotonous diets that occasionally gain faddish supporters. (idmprogram.com)
If the prescription food comes in both tinned and biscuit form this might add variety to an otherwise monotonous diet. (messybeast.com)
The mealybug uses its two partners to supplement its monotonous diet of plant sap. (discovermagazine.com)