Wordnet polsko-angielski 
                         (tediously repetitious or lacking in variety
"a humdrum existence
all work and no play"
 "nothing is so monotonous as the sea") 
humdrum, monotonous 
synonim: jednostajny
synonim: monotonny
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                        monotone
Nowoczesny słownik polsko-angielski 
                        monotonic