irksome vs ho-hum

irksome and ho-hum both are adjectives.

Word	Noun	Adjective	Verb	Adverb
irksome	No	Yes	No	No
ho-hum	No	Yes	No	No

As adjectives, irksome and ho-hum are synonyms defined as:

Other synonyms of irksome include boring, deadening, dull, slow, tedious, tiresome, wearisome.

irksome (adjective)	ho-hum (adjective)
so lacking in interest as to cause mental weariness	so lacking in interest as to cause mental weariness