This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

ad. In a manner that leaves no possibility of doubt; undoubtedly.

ad. Undoubtedly; unquestionably; in a manner to remove all doubt.

In an indubitable manner; unquestionably; without or beyond doubt; evidently.

ad. in a manner or to a degree that could not be doubted

""I hope you're being paid to do this," said a stout patron, well-suited in navy, the label indubitably Italian."

indubitable   

undoubtedly    unquestionably    without a doubt    sure thing    doubtlessly    certainly    undoubtably   

unembittered    short-sale    unite    truth-seeking    daft    quick-thinking    well-intended    unkingly    instrumentalization    cord-like