ho-hum vs tiresome

ho-hum and tiresome both are adjectives.

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

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

ho-hum and tiresome: so lacking in interest as to cause mental weariness

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

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