Collocations for neutral - adj.

be
remain, stay

strictly
The government maintained its strictly neutral policy.

completely
broadly (esp. BrE)
The Russians took a broadly neutral position.

politically, religiously
The meeting must be at a politically neutral location.

about
neutral about this issue

be, seem
Her expression seemed neutral.

remain
keep sth
Dolly kept her voice carefully neutral.

perfectly
fairly, quite, relatively
She chose fairly neutral make-up.

apparently
carefully

be, seem

culturally, ethically, ideologically, morally, politically
Our actions are never culturally neutral.

Neutral is used with these nouns:
background, colour, context, country, expression, ground, observer, party, shade, stance, territory, tone, venue, wire, zone