He was very unhelpful.
These are the most unhelpful instructions I have ever read.
Here are some sentences.
That is the most unhelpful advice I've ever gotten.
Your assistance is actually unhelpful.
The surly man behind the desk was most unhelpful
* The ruthless supervisor never stopped searching for tiny or unhelpful answers.
When people reply to a question by repeating the question that was asked, that is unhelpful.
Unhelpful.
unhelpful
Inadequate is an example.
useless, worthless, unconstructive, unhelpful...
Unenthusiastic, unhelpful, pessimistic, nonconstructive, downbeat, disapproving, discouraging...
The convex of the microscope lens proved to be unhelpful as I still could not find Jupiter.
Helpful is a word that describes something that is useful and gives aid. The opposite of helpful would be unhelpful, useless, destructive, damaging, worthless, or hindrance
Ambiguity is a word used to describe an uncertainty of something. A good sentence would be, there seems to be no ambiguity in this part of the textbook.
Information that is irrelevant is unnecessary or unhelpful to the situation. An example sentence using the word irrelevant would be, "The cost of the product is irrelevant because we already know that we are not buying it."