A sense of foreboding seemed to permeate the town.
The smell from the garbage dump would permeate the air during the summer.
The fireproofing agent has to permeate the material to be effective.
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It was obvious that she was upset when she stormed out of the room.
Permeability is not a property which applies to gases, which always allow substances to pass through them. It is a word we use for solids which have holes or cracks which allow liquid through.
I understand your query. You can use the word "natheless" in a sentence like "She was tired; natheless, she pushed herself to finish the project on time."
The sentence should be revised to: "It was raining."
The word "ingenuous" would be used in a sentence like the word primitive. A example would be: "He told the truth because he was ingenuous." It can be also used for the phrase "ingenuous question".