Both Uses of
monotonous
in
The Phantom Tollbooth
- The sky became quite gray and, along with it, the whole countryside seemed to lose its color and assume the same monotonous tone.†
p. 22.2 *monotonous = lacking in variety and/or boring
- Mile after mile after mile after mile, and everything became graver and more monotonous.†
p. 22.7
Definition:
lacking in variety -- typically boring