i Register
In some senses, harmless is marked as obsolete. Watch for register when choosing this word.
VERBS
appear, be, look, seem, sound
make sth, render sth
The treatment plant makes the toxic water harmless before releasing it into the river.
consider sth
ADV
absolutely, completely, perfectly, quite, totally | almost, virtually
enough
The old dog seemed harmless enough, though the children were still nervous about petting it.
comparatively, fairly, pretty, reasonably, relatively
apparently, seemingly
The old dog was apparently harmless, but the mailman still seemed nervous around him.
environmentally
PREP
to
The new cleaning product is completely harmless to children and pets.