unrestrainedly

In unbridled fashion

Without restraint or inhibition; freely and without holding back.

The adverb describes action taken with complete abandon or lack of self-control: She laughed unrestrainedly at his jokes, He wept unrestrainedly when he heard the news.

The word is formal and somewhat awkward—most speakers would choose without restraint or simply freely.

boundlessly

limitlessly

Without any bounds

vastly · immeasurably · inexhaustibly · interminably · perpetually · ceaselessly · unendingly · profusely · abundantly · lavishly

exuberant

ebulliently

With bubbling enthusiasm

jubilantly · vivaciously · zestfully · animatedly · spiritedly · fervently · passionately · joyously · buoyantly · energetically

freely

liberally

In generous measure

willingly · loosely · casually · informally · flexibly · permissively · unguardedly · unselfconsciously · expressively · outspokenly

wildly

savagely

In a brutal manner

ferociously · chaotically · rampantly · madly · frenziedly · maniacally · violently · turbulently · tempestuously · uncontrollably

Opposites
degree of control/restraint

unrestrainedlymoderately

To a limited degree

temperately · measuredly · reservedly · sparingly · conservatively

emotional/expressive moderation

unrestrainedlyguardedly

With protective caution

cautiously · reservedly · carefully · circumspectly · discreetly

rationality vs. impulse

unrestrainedlyrationally

In a logical manner

deliberately · calculatedly · judiciously · prudently · soberly

Family

unrestrained

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