prematurely

Before the time

Prematurely means before the proper or expected time.

A baby born prematurely arrives before full term.

Someone who ages prematurely shows signs of aging earlier than typical.

Hair can gray prematurely.

To act prematurely is to act too soon: Don't celebrate prematurely—we haven't won yet.

The word often carries a sense of unfortunate timing or incompleteness.

hasty

impulsively

Without prior deliberation

impetuously · headlong · incautiously · ill-advisedly · foolhardily · heedlessly · unthinkingly · injudiciously · carelessly · brashly

early

precociously

With premature sophistication

initially · beforehand · ahead-of-time · early · previously · preliminarily · preemptively · priorly · antecedently · soon

underdeveloped

incompletely

Not to the end

underdeveloped · stunted · abortively · insufficiently · partially · imperfectly · deficiently · unfinished · half-baked · inadequately

untimely

inopportunely

At an unsuitable time

unfortunately · malapropos · unsuitably · unfavorably · inauspiciously

Opposites
timing relative to expected/appropriate moment

prematurelybelatedly

After the expected time

late · tardily · too late · after the fact · behind schedule

readiness/maturity

prematurelydeliberately

Done with intention

in due course · naturally

developmental readiness

prematurelyin due course

When appropriately expected

in good time · timely

Phrases
Family

premature, prematureness

Familiarity
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Known to kids · Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G