Adjectives that I don't actually know how to use

So in desire to learn vocabulary, I realized that I have rather neglected my grammar, so I don't actually know entirely how to use all these adjectives that I have been learning, but as my time is limited right now, I shall leave that for a later post. 

Today's words (though they're still at recognizable-but-not-memorized stage) are:

rippa - magnificent

heta - unskillful, bad (at)

omoshiroi - interesting

tsuyoi - strong

dare - who 

donata - who (more formal, more often used by women)

Also, in some random news, watashi no tomodachi Risa san who is a shufu is pregnant with her second child! How's that for a random mixed-language sentence?