IPA: /rɪˈdaʊtəblɪ/
KK: /rɪˈdaʊtəblɪ/
In a way that inspires fear or respect; formidable.
The general was redoubtably known for his strategic brilliance in battle.
Redoubtably → It is formed from "re-" (meaning again) and "doubt" (from Old French *douter*, meaning to fear or be uncertain) and "-ably" (meaning in a manner). The word means in a manner that can be doubted again, or without doubt, emphasizing certainty.
Think of 'doubt' and remember that 'redoubtably' means in a manner that is certain or cannot be doubted.