Morphemes in “illogical”
“illogical” has 3 morphemes: in- + logic + -al.
il
prefix
+
logic
root
+
al
suffix
Spelling changes when the parts join: the boxes show the letters as written; the morphemes themselves are in- + logic + -al.
Each morpheme explained
| Morpheme | Type | Free / bound | Meaning |
|---|---|---|---|
| in- (written il) | derivational prefix | bound | not (form of in- before l) |
| logic | free root | free | the branch of philosophy that analyzes inference |
| -al | derivational suffix | bound | relating to, of the kind of |
How the word is built
logic → logical → illogical
Each step adds one affix to the word before it; the root “logic” is where the chain starts.
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Segmentation derived from MorphyNet (Batsuren, Bella & Giunchiglia, 2021; CC BY-SA 3.0, built from Wiktionary), with hand-written affix glosses and root meanings from WordNet. Reviewed for classroom use; tell us if you spot an error.
Frequently Asked Questions
How many morphemes are in "illogical"?
"illogical" has three morphemes: in- + logic + -al.
How do you break "illogical" into morphemes?
in- + logic + -al. The root is "logic"; in- is a derivational prefix, -al is a derivational suffix.
What is the root word of "illogical"?
The root of "illogical" is "logic", built up as logic → logical → illogical.
Is this morphology tool free?
Yes. The Fixie morphological analyzer is free with no signup and runs in your browser.