tiresome vs tedious

tiresome and tedious both are adjectives.

Word	Noun	Adjective	Verb	Adverb
tiresome	No	Yes	No	No
tedious	No	Yes	No	No

As adjectives, tiresome and tedious are synonyms defined as:

tiresome and tedious: so lacking in interest as to cause mental weariness

Other synonyms of tiresome include boring, deadening, dull, ho-hum, irksome, slow, wearisome.

tiresome (adjective)	tedious (adjective)
so lacking in interest as to cause mental weariness	using or containing too many words
	so lacking in interest as to cause mental weariness