Definition: involving less than the standard or customary time for an activity
Usage: part-time employees; a part-time job
Similar words: half-time
Definition: involving half the standard or customary time for an activity
Usage: he had two years of half-time training
Similar words: temporary, irregular
Definition: lacking continuity or regularity
Usage: an irregular worker; employed on a temporary basis
Similar words: odd-job
Definition: not regular or skilled
Usage: found only odd-job employment
Similar words: underemployed
Definition: employed only part-time when one needs full-time employment or not making full use of your skills
Usage: migrants are likely to be poor and underemployed; able people are kept underemployed