Grammar
Style guide 
flammable and inflammable
Flammable means able to be set aflame
Inflammable means able to be set aflame, easily excited or disturbed
According to the Macquarie Dictionary traditionally 'inflammable' meant likely to burn easily, but to avoid a false analogy with other words such as 'inactive' in which the 'in' means 'not', 'flammable' was adopted as the standard warning in labelling goods. The opposite is 'nonflammable'.
Grammar e-book and e-newsletter
If you found this tip useful, you might like to buy
but and however
complement and compliment
different from, different than or different to
disinterested and uninterested
fewer and less
persons or people?
proportional or proportionate
round and around
than and then
though and although
while or whilst