irregular

Think of a heartbeat: it is usually steady, but sometimes it is irregular, meaning it does not follow the usual pattern. That is the main idea of "irregular": not following a fixed rule, shape, or rhythm. A regular tile has even sides; one with a chipped corner has an irregular shape. An irregular verb does not follow the usual pattern for tense changes, like "go," "went," and "gone." You might also describe handwriting as irregular if the letters change a lot in size and shape, or a schedule as irregular if work hours change from week to week.

Imagine building with LEGO bricks. If all the bricks are the same size and shape, you can create a neat, predictable structure—that's regular. But what happens when you throw in some oddly shaped pieces? Suddenly things get more complicated, less uniform… irregular. That's the essence of this word!

"Irregular" describes something that does not match the usual rule, pattern, shape, or timing. It can apply to many different things. A heartbeat is irregular if it speeds up and slows down in a way that is not steady. Coastlines are often irregular, with many bays and inlets instead of straight lines.

In grammar, "irregular" is a vital concept. Irregular verbs (like be, have, or do) don't follow the usual rules for forming the past tense or past participles—you have to memorize them individually. Similarly, irregular nouns might form plurals in unexpected ways (think of "child" and "children").

Beyond that, "irregular" can describe an uneven surface ("the road was rough and irregular"), a non-standard schedule ("she had an irregular work pattern"), or anything unusual enough to stand out from what is normal. A detective might study regular activity to find a baseline, but pay close attention to irregular activity: the things that do not seem quite right.

So, if something doesn't fit the mold, isn't predictable, or breaks the rules, it's likely irregular. It's a word about deviation, difference, and anything that stands out from the expected pattern.