Tiring x Tiresome: Qual a diferença

When you say that something or someone is tiresome what you are implying is that the object or person is making you feel irritated, annoyed, or bored.

Tiring is anything that makes you feel tired.

cansativo
[adjetivo]

1. (fisicamente) = tiring.
2. (que causa tédio) = boring.
3. (pessoa, tarefa, etc...) = boring / tiresome.

Meu dia foi cansativo.
>> My day was tiring. = dia exaustivo; cansativo.

Eu assisti um filme cansativo
>> I ('ve) watched a boring movie.

Mas que tarefa mais cansativa.
>> What a tiresome task. = tarefa chata; cansativa.

REFERENCE: Pearson Education. Longman Dictionary. 2004.