| so-and-so(adjective, strange, new, remote, mysterious) |
| such-and-such(adjective, strange, new, remote, mysterious) |
| thankless(adjective, unappreciated) |
| unacclaimed(adjective, unacknowledged) |
| unapprehended(adjective, strange, new, remote, mysterious) |
| unascertained(adjective, strange, new, remote, mysterious) |
| uncharted(adjective, strange, new, remote, mysterious) |
| unconsidered(adjective, unseen, ignored, undiscovered, overlooked) |
| under the radar |
| undistinguished(adjective, strange, new, remote, indefinite) |
| unestablished |
| unexplained(adjective, strange, new, remote, mysterious) |
| unexplored(adjective, strange, new, remote, mysterious) |
| unfamed(adjective, unacknowledged) |
| unglorified(adjective, unacknowledged) |
| unhailed(adjective, unacknowledged) |
| unheard-of(adjective, strange, new, remote, indefinite) |
| unheeded(adjective, unseen, ignored, undiscovered, overlooked) |
| unheralded(adjective, unsung) |
| unhonored(adjective, unacknowledged) |