irksome vs tiresome

irksome and tiresome both are adjectives.

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

As adjectives, irksome and tiresome are synonyms defined as:

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

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

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