Degrees of certainty illustrated with examples:
1️⃣100% (Absolutely):
"She is absolutely certain about her decision."

2️⃣90% (Certainly):
"He will certainly pass the exam after studying so hard."

3️⃣80% (Probably):
"It will probably rain later, so bring an umbrella."

4️⃣70% (Likely):
"Our team is likely to win the match tonight."

5️⃣60% (Possibly):
"We could possibly finish the report before Friday."

6️⃣50% (Maybe):
"Maybe we can grab lunch together tomorrow."

7️⃣40% (Unlikely):
"It is unlikely that the flight will arrive early."

8️⃣30% (Improbably):
"He improbably solved the complex puzzle on his first try."

9️⃣20% (Hesitant to say):
"I am hesitant to say who will get the promotion."

1️⃣0️⃣10% (Hardly ever):
"They hardly ever travel during the winter."

1️⃣1️⃣0% (Absolutely not):
"I will absolutely not sign that contract."