tiresome vs irksome

tiresome and irksome both are adjectives.

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

As adjectives, tiresome and irksome are synonyms defined as:

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

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

tiresome (adjective)	irksome (adjective)
so lacking in interest as to cause mental weariness	so lacking in interest as to cause mental weariness