irksome vs tedious

irksome and tedious both are adjectives.

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

As adjectives, irksome and tedious are synonyms defined as:

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

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

irksome (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