Synonym: abnormal, distorted, erratic, rough, uneven, unnatural. Antonym: regular. Similar words: regular, regularly, at regular intervals, regulate, regulator, regulatory, regulation, triangular. Meaning: [ɪ'regjələ(r) /-gjʊl-] 
n. 1. a member of an irregular armed force that fights a stronger force by sabotage and harassment 2. merchandise that has imperfections; usually sold at a reduced price without the brand name. adj. 1. contrary to rule or accepted order or general practice 2. (of solids) not having clear dimensions that can be measured; volume must be determined with the principle of liquid displacement 3. not occurring at expected times 4. (used of the military) not belonging to or engaged in by regular army forces 5. deviating from normal expectations; somewhat odd, strange, or abnormal 6. lacking continuity or regularity 7. of a surface; not level or flat 8. independent in behavior or thought.
n. 1. a member of an irregular armed force that fights a stronger force by sabotage and harassment 2. merchandise that has imperfections; usually sold at a reduced price without the brand name. adj. 1. contrary to rule or accepted order or general practice 2. (of solids) not having clear dimensions that can be measured; volume must be determined with the principle of liquid displacement 3. not occurring at expected times 4. (used of the military) not belonging to or engaged in by regular army forces 5. deviating from normal expectations; somewhat odd, strange, or abnormal 6. lacking continuity or regularity 7. of a surface; not level or flat 8. independent in behavior or thought. 
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1) She touched its tough irregular surface.
2) The heartbeat was feeble and irregular.
3) The cells are slightly irregular in shape.
4) It has a highly irregular shape, covered in bumps and indentations.
5) Beamish only returned to Britain at irregular intervals .
6) He's receiving medication for an irregular heartbeat.
7) I worked quite irregular hours.
8) He visited his parents at irregular intervals.
9) 'Child' has an irregular plural,[http://sentencedict.com/irregular.html] ie 'children'.
10) His behaviour is highly irregular.
11) Releasing the goods without an invoice is most irregular.
12) Cars passed at irregular intervals.
13) " Caught " is an irregular past tense form.
14) They met at irregular intervals.
15) She tested us on irregular verbs.
16) Her irregular heartbeats began to even out.
17) She tested the whole class on irregular verbs.
18) He had bad teeth, irregular and discolored.
19) We have a test on irregular verbs tomorrow.
20) Funeral directors often work long, irregular hours .
21) He visits us at irregular intervals.
22) Working irregular hours is all part and parcel of being a journalist.
23) It would be highly irregular for a police officer to accept money in this way.
24) It would be highly irregular for a minister to accept payments of this kind.
25) This dictionary has several appendices, including one on irregular verbs.
26) I recognized the doctor's messy, irregular handwriting.
27) The hammering began again, loud, insistent and irregular.
28) The conjugations of these irregular verbs.
29) Working Conditions Funeral directors often work long, irregular hours.
30) The contour of the Atlantic coast of America is very irregular.
More similar words: regular, regularly, at regular intervals, regulate, regulator, regulatory, regulation, triangular, irrelevant, irreverent, irrevocable, irreverence, irrespective of, coagulate, secular, popularity, tabula rasa, particular, spectacular, in particular, particularly, engulfed, barrel, marred, regain, arrest, arrear, region, regime, regard.