fearsome
adj.describing something that looks very scary or powerful. You use it for things that make people feel afraid because they are strong or dangerous.
adj.inspiring fear or respect through an impressive or intimidating appearance or character.
“The tiger had a fearsome set of teeth.”
“The team faced a fearsome opponent in the finals, known for their aggressive and fast-paced style of play.”
“The fortress was protected by a fearsome array of cannons and high stone walls that had discouraged invaders for centuries.”
Often used to describe physical appearance, reputations, or natural forces.
“The actor also played fearsome clown Pennywise in the 1990 TV version of Stephen King's It, and was Long John Silver in 1996's Muppet Treasure Island.”
From fear + -some. Compare German furchtsam (“fearful”, obsolete also “fearsome”); this is more closely equivalent to English frightsome, however.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.