Princeton's WordNet

1. boredom, ennui, tedium(noun)

   the feeling of being bored by something tedious

Kernerman English Learner's Dictionary

1. boredom(noun)ˈbɔr dəm, ˈboʊr-

   the state of being bored

   the endless boredom of her desk job

Wiktionary

1. boredom(Noun)

   The state of being bored.

2. boredom(Noun)

   An instance or period of a state of being bored; a variety of bored state.

Webster Dictionary

1. Boredom(noun)

   the state of being bored, or pestered; a state of ennui

2. Boredom(noun)

   the realm of bores; bores, collectively

The Roycroft Dictionary

1. boredom

   1. The essential nature of monogamy. 2. A period or rest between I Did and I Will. 3. A state of divine revelation wherein for a single moment we are carried by the giant of Eternal Inutility to the abysms and summits of the perpetual Nix. (The word _boredom_ comes from Bore, a tired son of Noah. After the subsidence of the waters, Bore wandered about the earth, yawning and gaping and stretching, for at that time malaria oozed from many stagnant pools. Finally, absolutely exhausted, Bore, being afraid to be down on the damp and slimy soil, rested on the seventh day on his own bean, hence boredom.)

U.S. National Library of Medicine

1. Boredom

   A psychological state resulting from any activity that lacks motivation, or from enforced continuance in an uninteresting situation.

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