This is the 39th most frequent Hebrew word.
ללא
"Without"
Here, 'ללא' (without) is used to describe the absence of an object, i.e., the umbrella, in the context of 'he leaving the house.'
הוא יצא מהבית ללא מטריה.
He left the house without an umbrella.
In this sentence, 'ללא' (without) is part of the phrase 'ללא ספק' meaning 'without a doubt', showing emphasis or affirmation regarding the need for assistance.
ללא ספק הוא זקוק לעזרה.
Without a doubt, he needs help.
'ללא' (without) here implies the absence of disturbances or interruptions during the occurrence of the event.