"Self-Possessed" is a word in ENGLISH

self-possessed ENGLISH
Definition:

Composed or tranquill in mind, manner, etc.;
undisturbed.

Few words of positivity

All are lunatics, but he who can analyze his delusion is called a philosopher.

Ambrose Bierce, The Collected Writings Of Ambrose Bierce

WORD SUGGESTIONS
Laugh your heart out.

Why didn't the monster use toothpaste? Because he said his teeth weren't loose.

compose ENGLISH

To free from agitation or disturbance; to tranquilize; to soothe; to calm; to quiet.

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composed ENGLISH

Free from agitation; calm; sedate; quiet; tranquil; self-possessed.

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lugpay HILIGAYNON

lúgpay - To mollify, placate, soothe, pacify, assuage, ease, abate, appease, moderate, compose, tranquillize. Lugpayá ang íya kaákig. Placate his …

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repose ENGLISH

Rest of mind; tranquillity; freedom from uneasiness; also, a composed manner or deportment.

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reposed ENGLISH

Composed; calm; tranquil; at rest.

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sedate ENGLISH

Undisturbed by passion or caprice; calm; tranquil; serene; not passionate or giddy; composed; staid; as, a sedate soul, mind, or …

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tranquillize ENGLISH

To render tranquil; to allay when agitated; to compose; to make calm and peaceful; as, to tranquilize a state disturbed …

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