IPA: /ˈtɛn.sɛst/
KK: /tɛnsɛst/
The most stretched or tight; having the highest level of tension.
The atmosphere in the room was the tensest it had ever been during the meeting.
Comparative: tenser
Superlative: tensest
Tensest → It is formed from "tense" (from Latin "tensus", meaning stretched) and the superlative suffix "-est" (meaning most). The word "tensest" means the most stretched or the highest degree of tension.
Think of something that is 'stretched' ('tense') to its maximum — that's why 'tensest' means the most stretched or under the highest tension.