say it: TEE-dee-uhs
tedious is an adjective meaning "so lacking in interest as to cause mental weariness". It carries 2 recorded senses.
so lacking in interest as to cause mental weariness
“a boring evening with uninteresting people”
“the deadening effect of some routine tasks”
“a dull play”
“his competent but dull performance”
“a ho-hum speaker who couldn't capture their attention”
“what an irksome task the writing of long letters is”
“tedious days on the train”
“the tiresome chirping of a cricket”
“other people's dreams are dreadfully wearisome”
using or containing too many words
“long-winded (or windy) speakers”
“verbose and ineffective instructional methods”
“newspapers of the day printed long wordy editorials”
“proceedings were delayed by wordy disputes”
Definitions, synonyms and semantic relations for tedious come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.