no, it is quite common and used often when stating opinions and thought of yourself or others.
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Irregular. Or perhaps... Occasional.
The word 'irregular' is both a noun and an adjective.The noun irregular is a word for a piece of merchandise that contains a flaw, which is often sold at a reduced price; and a word for a soldier who does not belong to the armed forces of a country.The noun form for the adjective irregular is irregularity.
6 (and the word is irregular, not unregular).
It is irregular.
It is an irregular polygon.