There is no prefix.
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Words that begin with the prefix "ir" and mean "not" include irregular, irresponsible, irrelevant, and irrational.
The prefix "phob" means fear or avoidance. It is commonly used in words related to phobias, which are extreme or irrational fear of specific things or situations.
irresponsibleirregularirrationalirrevocableirrefutableirradiateirreconcilableirrecoverableirredeemableirreducibleirrefutableirregularityirrelevantirreverenceirreligiousirreparableirreplaceableirreversibleirresoluteirretrievableirresistibleIrrelevantirretrievable, ... This prefix only comes before words starting with r.
The prefix for inadequate is in-. The prefix in- means not.
The prefix for include is in-. This prefix means not.