In the following question, out of the four alternatives, select the alternative which is the best substitute of the phrase.
Lacking flavour, weak or tasteless
Intrepid means fearless. Invalid means a person made weak by injury. Annoying means irritating.
The only word that gives the intended meaning is Insipid.$
e.g. The world is too full of insipid things anyway.
Therefore, the correct answer is option 1.