Mentally dull; stupid.
Marked by or indicating a lack of maturity; puerile:
Having a flat heel or no heel
Not fully grown or developed:
(Geology) Relating to or being water, gas, or a mineral-rich fluid believed to have originated from magma and to have come to the earth's surface for the first time.
Producing little or no vegetation; unfruitful:
Worn out by constant use; no longer having freshness, originality, or novelty; stale
Lacking the qualities requisite for spiritedness and originality
Able to be depended on for the discharge of obligations incurred; of unimpaired credit.
Developing from childhood to maturity; growing up
The definition of puerile is something characteristic of or related to a child, especially silly, trivial or childish behavior.
Lacking or appearing to lack substance or reality:
Find another word for jejune. In this page you can discover 28 synonyms, antonyms, idiomatic expressions, and related words for jejune, like: arid, banal, dull, vapid, barren, bland, childish, empty, flat, immature and inane.