Полный русско-английский словарь
Нареч.; вводн. undoubtedly, without doubt/question несомненн|о — undoubtedly, indisputably; он, ~, придёт heś sure to come; ~ость ж. certainty; ~ый undoubted, unmistakable, indisputable; ~ый успех an indisputable/indubitable success.