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Webster 1913 Edition

Adj.

Of or relating to a peak; or to peaks; belonging to a mountainous region.

“Her peakish spring.”

Drayton.

“His peakish dialect.”

Bp. Hall.

Having peaks; peaked.

Having features thin or sharp, as from sickness; hence, sickly.

[Colloq.]

Adj.

Denoting or belonging to an acuminated situation.

peakish ‎(comparative more peakish, superlative most peakish)

(colloquial) Of or relating to a peak or peaks; belonging to a mountainous region.

Her peakish spring. — Drayton.

His peakish dialect. — Bishop Hall.
(colloquial) Having peaks; peaked.
(colloquial) Having thin or sharp features, as from sickness; sickly; peaky.