From Mind Hacks:
As an aside, once, whilst drinking with a psycholinguist (say that after a few pints) I was taught a useful way of quickly working out the stressed syllable in any English word – something which is apparently called the ‘fuck test’.
Simply insert the word ‘fucking’ into the word, as if you were using the swear word for emphasis, and the syllable that follows the ‘fucking’ is the stressed syllable.
For example, absolutely -> abso-fucking-lutely. The stressed syllable is the third: i.e. absolutely. It works for every multi-syllable word I’ve found so far.