Words to Describe undertaking

How undertaking often is described ("________ undertaking")

• desperate
• such
• useful
• private
• tremendous
• worthwhile
• present
• solemn
• big
• successful
• joint
• laborious
• vast
• entire
• colossal
• challenging
• rash
• great
• operative
• huge
• important
• massive
• formidable
• commercial
• serious
• impossible
• easy
• worthy
• stupendous
• heroic
• public
• risky
• arduous
• costly
• difficult
• gigantic
• hopeless
• cooperative
• delicate
• grand
• expensive
• precarious
• daring
• mammoth
• dangerous
• noble
• monumental
• hazardous
• immense
• profitable
• dominant
• worth
• collective
• laudable
• voluntary
• complicated
• literary
• ambitious
• largest
• bold
• major
• extensive
• complex
• enormous
• perilous
• industrial
• whole