The root word of "ruinous" is "ruin," which means to destroy or bring to an end.
The girl was trying be ruinous to the other students.
There is one syllable for the word what.
The city had suffered a ruinous series of natural disasters. The couple's lifestyle resulted in ruinous personal debt, and eventual bankruptcy.
The word "have" has just one syllable.
The word "gum" has one syllable.
The word "dread" has one syllable.
The word "past" has one syllable.
The word "strap" has one syllable.
The word "tell" has one syllable.
The word plant has one syllable. This means that there is no syllable divide for this word.
In the word "the", there is one syllable.