This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Tiresome by reason of length, slowness, or dullness; boring. See Synonyms at boring.

adj. Obsolete Moving or progressing very slowly.

adj. Boring, monotonous, time consuming, wearisome.

adj. Involving tedium; tiresome from continuance, prolixity, slowness, or the like; wearisome.

Wearisome; irksome; tiresome.

Annoying; disagreeable; offensive; uncongenial.

Slow; slow-going: as, a tedious course.

Synonyms Tiresome, Irksome, etc. See wearisome.

adj. so lacking in interest as to cause mental weariness

adj. using or containing too many words

"CARROLL: Truckers say a ban would slow deliveries and make what they call a tedious job worse."

uninteresting    prolix   

tedium    TED   

tediously    tediousness   

irksome    fatiguing    wearisome    dull    tiresome   

tiresome    painful    dreary    lengthy    laborious    bore    dull    monotonous    useless    fruitless