formidable

So strong, powerful, or impressive that people respect or fear it.

• She is a formidable opponent.
• Their team has become a formidable force in the league.
• His formidable memory impressed everyone at the meeting.

Similar words: powerful, impressive, intimidating

Opposites: weak

Common phrases: a formidable opponent, a formidable team, a formidable reputation, a formidable presence

Very difficult to deal with, complete, or overcome.

• We face a formidable task.
• The steep cliffs presented a formidable obstacle.
• Building a school in this remote village was a formidable challenge.

Similar words: daunting, challenging, difficult

Opposites: easy

Common phrases: a formidable task, a formidable challenge, a formidable obstacle